Publications

       
1. M. Venkatesan, S.K. Das and A.R. Balakrishnan, "Effect of Diameter on Two-phase Pressure Drop in Narrow Tubes", Experimental Thermal and Fluid Science, 35, 531-541, (2011).
2. T. Basak, R.S. Kaluri and A.R. Balakrishnan, "Effects of Thermal Boundary Conditions on Entropy Generation During Natural Convection",  Numerical Heat Transfer, Part A: Applications, 59, 372-402, (2011).
3. M. Venkatesan, S.K. Das and A.R. Balakrishnan, "Effect of Tube Diameter on Two-phase Flow Patterns in Mini Tubes", Canadian Journal of Chemical Engineering, 88, 936-944, (2010).
4. M. Venkatesan, A.R. Balakrishnan and Sarit Kumar Das, "Effect of Tube Diameter on Elongated Bubble Length in Mini Channels", Proceedings of the Third International Conference on Thermal Issues in Emerging Technologies Theory and Application - ThETA 3, Cairo, Egypt, December 19-22, 2010.
5. A.R. Balakrishnan, S.K. Das, M. Venkatesan and M. Aravinthan, "Fluid Flow and Boiling Heat Transfer in Mini Channels" Proceedings of the 14th International Heat Transfer Conference, Washington D.C., USA, August 8-13, 2010.
6. A.R. Balakrishnan, T. Basak and R.S. Kaluri, "Effects of Thermal Boundary Conditions on Entropy Generation during Natural Convection in a Differentially Heated Square Cavity" Proceedings of the 14th International Heat Transfer Conference, Washington D.C., USA, August 8-13, 2010.
7. Tanmay Basak, G. Aravind, S. Roy and A.R. Balakrishnan, "Heatline Analysis of Heat Recovery and Thermal Transport in Materials Confined within Triangular Cavities", International Journal of Heat and Mass Transfer, 53, 3615-3628, 2010.
8. R. Sindhuja, A.R. Balakrishnan and S. Srinivasa Murthy, "Post-CHF Heat Transfer during Two-Phase Upflow Boiling of R-407C in a Vertical Pipe",  Applied Thermal Engineering, 30, 167-173 (2010).
9. G. Sateesh, S.K. Das and A.R. Balakishnan, "Experimental Studies on the Effect of Tube Inclination on Nucleate Pool Boiling", Heat and Mass Transfer, 45, 1493-1502 (2009). 
10. Tanmay Basak, S. Roy, Amit Singh and A.R. Balakrishnan, "Natural Convection Flows in Porous Trapezoidal Enclosures with Various Inclination Angles",  International Journal of Heat and Mass Transfer, 52, 4612-4623 (2009).
11. T. Basak, S. Roy, Krishna Babu and A.R. Balakrishnan, "Finite Element Analysis of Natural Convection Flow in a Isosceles Triangular Enclosure due to Uniform and Non-Uniform Heating at the Side Walls", International Journal of Heat and Mass Transfer, 51, 4496-4505 (2008).
12. R. Sindhuja, A.R. Balakrishnan and S. Srinivasa Murthy, "Critical Heat Flux of R-407C in Upflow Boiling in a Vertical Pipe", Applied Thermal Engineering, 28, 1058-1065 (2008).
13. P. Rajashekar, S. Jayanti and A.R. Balakrishnan, "Convective Heat Transfer in Single Phase Flow in a Vertical Tube subjected to Axial Low Frequency Oscillations", Heat and Mass Transfer, 44, 857-864 (2008).
14. P. Rajashekar, S. Jayanti and A.R. Balakrishnan, "Flow and Pressure Drop Fluctuations in a Vertical Tube subject to Low Frequency Oscillations", Nuclear Engineering and Design, 238, 178-187 (2008).
15. K. Aparna, Tanmay Basak and A.R. Balakrishnan, "Role of Metallic and Composite (Ceramic-Metallic) Supports on Microwave Heating of Porous Dielectrics", International Journal of Heat and Mass Transfer, 50, 3072-3089 (2007).
16. B.R. Vijayarangan, S. Jayanti and and A.R. Balakrishnan, "Pressure Drop Studies on Two-phase Flow in a Uniformly Heated Vertical Tube at Pressures up to the Critical Point", International Journal of Heat and Mass Transfer, 50, 1879-1891 (2007).
17. T. Basak, S. Roy and A.R. Balakrishnan, "Effects of Thermal Boundary Conditions on Natural Convection Flows within a Square Cavity", International Journal of Heat and Mass Transfer, 49, 4525-4535 (2006).
18. T. Basak, K. Aparna, A. Meenakshi and A.R. Balakrishnan, "Effect of Ceramic Supports on Microwave Processing of Porous Food Samples", International Journal of Heat and Mass Transfer, 49, 4325-4339 (2006).
19. B.R. Vijayarangan, S. Jayanti and A.R. Balakrishnan, "Studies on Critical Heat Flux in Flow Boiling at Near Critical Pressures", International Journal of Heat and Mass Transfer, 49, 259-268 (2006).
20. T. Basak, K. Aparna, A. Meenakshi and A. R. Balakrishnan, Influence of Ceramic Supports on Efficient Microwave Heating of Porous Dielectrics, Paper HT2005-72113, Proceedings of 2005 ASME Summer Heat Transfer Conference, July 17-22, 2005, San Francisco, California, USA.
21. M. Vijayan, S. Jayanti and A. R. Balakrishnan, "On Axial Coherence of Interfacial Waves in Countercurrent Flow", AIChE Journal, 51, 2098-2102 (2005).
22. G. Sateesh, S. K. Das and A. R. Balakrishnan, "Analysis of Pool Boiling Heat Transfer : Effect of Bubbles Sliding on the Heating Surface," International Journal of Heat and Mass Transfer, 48, 1543-1553 (2005).
23.

G. Vinayak Rao and A. R. Balakrishnan, "Heat Transfer in Nucleate Pool Boiling of Multicomponent Mixtures," Experimental Thermal and Fluid Science, 29, 87-103 (2004).

24.

G. Vinayak Rao and A. R. Balakrishnan, "Nucleate Pool Boiling Heat Transfer of Multicomponent Mixtures," Chemical Engineering Research and Design, Trans. IChemE, 82,(1), 43-52 (2004).

25.
M. Vijayan, S. Jayanti and A. R. Balakrishnan, "Experimental Study of Air-Water Countercurrent Annular Flow at Post Flooding Conditions," International Journal of Multiphase Flow, 28, 51-67 (2002).
26.
J. E. B. Nelson, A. R. Balakrishnan and S. Srinivasa Murthy, "Heat Transfer Analysis of a Thermally Stratified Storage Tank," Paper presented at the 2nd International Symposium on Advances in Computational Heat Transfer, Palm Cove, Queensland, Australia, 20-25 May 2001.
27.
M. Vijayan, S. Jayanti and A. R. Balakrishnan, "Effect of Tube Diameter on Flooding",  International Journal of Multiphase Flow, 27, 797-816 (2001).
28.
K. B. Radhakrishnan and A. R. Balakrishnan, "Kinetics of Melt Crystallization of Eutectic Forming Organic Mixtures in Non-flow Systems," Chemical Engineering and Processing, 40, 71-81 (2001).
29.
B. B. K. Uma Maheshwara Rao and A. R. Balakrishnan, "Enhanced Pool Boiling Heat Transfer using Interference Plates," Proceedings of the 2000 National Heat Transfer Conference, Pittsburgh, USA, August 20-22, 2000.
30.
R. J. Benjamin and A. R. Balakrishnan, "Nucleate Pool Boiling Heat Transfer of Binary Mixtures at Low to Moderate Heat Fluxes," Trans. ASME, Journal of Heat Transfer, 121, 365-375 (1999).
31.
M. Vijayan, C. Indu, S. Jayanti and A. R. Balakrishnan, "Circumferential Coherence of Waves in Falling Film and the Mechanism of Flooding in Countercurrent Flow," Two Phase Flow Modelling and Experimentation 1999 - Proceedings of the Second International Symposium on Two Phase Flow Modelling and Experimentation, Pisa, Italy, May 23-25, 1999; pp. 607-611.
32.
K. B. Radhakrishnan and A. R. Balakrishnan, "Kinetics of Melt Crystallization in Falling Films," Chemical Engineering Communications, 171, 29-53 (1999).
33.
J. E. B. Nelson, A. R. Balakrishnan and S. Srinivasa Murthy, "Experiments on Stratified Chilled Water Tanks," International Journal of Refrigeration, 22, 216-234 (1999).
34.
J. E. B. Nelson, A. R. Balakrishnan and S. Srinivasa Murthy, "Parametric Studies on Thermally Stratified Chilled Water Storage Systems," Applied Thermal Engineering , 19, 89-115 (1999).
35.
L. Muruganandam and A. R. Balakrishnan, "Experimental Studies on Flow Distribution in Z-type Radial Flow Reactors," Paper TS 1103, Indian Chemical Engineering Congress, Chemcon 98, Visakhapatnam, India, December 16 - 19, 1998.
36.
M. Vijayan, S. Jayanti and A. R. Balakrishnan, "Effect of Tube Diameter on Flooding in Countercurrent Annular Flow," Proceedings of 25th National Conference on Fluid Mechanics and Fluid Power and 1st International Conference on Fluid Mechanics and Fluid Power, New Delhi, India, December 15th to 17th, 1998; Vol. 2, 603-611.
37.
J. E. B. Nelson, A. R. Balakrishnan and S. Srinivasa Murthy, "Mixing and Wall Conduction Effects in a Stratified Hot Water Tank," Proceedings of the International Conference on Energy Research and Development, Kuwait, November 9-11, 1998, pp. 673-682.
38.
S. Madhusudana Rao and A. R. Balakrishnan, "Flow Boiling Heat Transfer on a Heating Element Restricted by an Interference Sleeve," International Journal of Heat and Fluid Flow, 19, 661-671 (1998).
39.
S. Madhusudana Rao and A. R. Balakrishnan, "Enhancement of Flow Boiling Heat Transfer on Cylinders using Interference Sleeves," Trans. ASME, Journal of Heat Transfer,120, 789-792 (1998).
40.
J. E. B. Nelson, A. R. Balakrishnan and S. Srinivasa Murthy, "Transient Analysis of Energy Storage in a Thermally Stratified Water Tank," International Journal of Energy Research, 22, 867-883 (1998).
41.
A. R. Balakrishnan, "Pool Boiling of Saturated Pure Liquids and Binary Mixtures: Effect of Surface Characteristics," Proceedings of the 11th International Heat Transfer Conference, Kyongju, Korea, 23 - 28 August 1998,  1, 71-87 (1998).
42.
A. R. Balakrishnan and S. Madhusudana Rao, "Enhanced Boiling Heat Transfer using Passive Augmentation Techniques," Paper no. HMT-97-010, pp. 119-127, Proceedings of the 14th National Heat and Mass Transfer Conference and Third ISHMT-ASME Heat Transfer Conference, Kanpur, India, December 29-31, 1997.
43.
S. Pal, S. Madhusudana Rao and A. R. Balakrishnan, "Pool Boiling Heat Transfer over Interference Plates," Paper no. HMT-97-069, pp. 549-554, Proceedings of the 14th National Heat and Mass Transfer Conference and Third ISHMT-ASME Heat Transfer Conference, Kanpur, India, December 29-31, 1997.
44.
R. J. Benjamin and A. R. Balakrishnan, "Nucleation Site Density in Pool Boiling of Binary Mixtures: Effect of Surface Microroughness and Surface and Liquid Physical Properties," Canadian Journal of Chemical Engineering, 75, 1080-1089 (1997).
45.
S. Madhusudana Rao and A. R. Balakrishnan, "Enhancement of Subcooled Flow Boiling Heat Transfer on Cylinders using Interference Sleeves," Journal of Enhanced Heat Transfer, 4, 203-215 (1997).
46.
S. Madhusudana Rao and A. R. Balakrishnan, "Analysis of Pool Boiling over Porous Surfaces," Wärme- und Stoffübertragung, 32, 463-469 (1997).
47.
R. J. Benjamin and A. R. Balakrishnan, "Nucleation Site Density in Pool Boiling of Saturated Pure Liquids: Effect of Surface Microroughness and Surface and Liquid Physical Properties,"  Experimental Thermal and Fluid Science, 15, 32-42 (1997).
48.
R. J. Benjamin and A. R. Balakrishnan, "Pool Boiling of Binary Mixtures," Journal of Energy, Heat and Mass Transfer, 18, 189-201 (1996).
49.
R. J. Benjamin and A. R. Balakrishnan, "Nucleate Pool Boiling Heat Transfer of Pure Liquids at Low to Moderate Heat Fluxes," International Journal of Heat and Mass Transfer, 39, 2495-2504 (1996).
50.
M. Sadasivam and A. R. Balakrishnan, "Heat Transfer in Packed Bed Direct Contact Heat Exchangers," Journal of Energy, Heat and Mass Transfer, 17, 185-189 (1996).
51.
S. Madhusudana Rao and A. R. Balakrishnan, "Enhancement of Heat Transfer in Pool Boiling using Interference Sleeves," Paper no. HMT-95-051, Proceedings of the 13th National Heat and Mass Transfer Conference and 2nd ASME-ISHMT Heat Transfer Conference, Surathkal, India, December 28-30, 1995.
52.
R. Swaminathan, M. Sadasivam and A. R. Balakrishnan, "Adiabatic Gas Absorption in Packed Columns with Large Heat Effects," Chemical Engineering and Technology, 18, 324-329 (1995).
53.
C. Hari, K. S. Balaraman and A. R. Balakrishnan, "Fluid Catalytic Cracking: Selectivity and Product Yield Patterns," Chemical Engineering and Technology, 18, 364-369 (1995).
54.
M. Sadasivam and A. R. Balakrishnan, "On the Effective Driving Force for Transport in Cooling Towers," Trans. ASME, Journal of Heat Transfer, 117, 512-515 (1995).
55.
M. Sadasivam and A. R. Balakrishnan, "Analysis and Design of Packed Bed Liquid Desiccant Dehumidifiers," Paper no. 11-PP-29, pp. 369-374, Vol. 5, Proceedings of the 10th International Heat Transfer Confere-nce, Brighton, UK, August 14-18, 1994.
56.
L. R. Oellrich, S. Srinivasa Murthy and A. R. Balakrishnan, "Alternatives to CFCs for Refrigeration Applications," An Indo-German Project - Technical Status Report, Forschungszentrum Julich GmbH (KFA), Vol. 25, 1994.
57.
M. Sadasivam and A. R. Balakrishnan, "Experimental Investigations on the Thermal Effects in Packed Bed Liquid Desiccant Dehumidifiers," Industrial and Engineering Chemistry Research, 33, 1636-1640 (1994).
58.
P. Sivagnanam, A. R. Balakrishnan and Y. B. G. Varma, "On the Mechanism of Subcooled Flow Boiling of Binary Mixtures," International Journal of Heat and Mass Transfer, 36, 681-689 (1994).
59.
M. Sadasivam and A. R. Balakrishnan, "Individual Heat Transfer Coefficients in Gas-Liquid Flow in Packed Beds," Paper HMT 94-097, pp. 667-670, Proceedings 12th National Heat and Mass Transfer Conference and First ASME-ISHMT Heat Transfer Confere-nce, Bombay, January 1994.
60.
M. Vinaya, D. Venkatanarasaiah, A. R. Balakrishnan, M. S. Ananth and Y. B. G. Varma, "A Study of Hydrodynamics in Counter-current Multistage Bubble Column," Paper presented at the Indian Chemical Engineering Congress, Chemcon 93, Bombay, December 1993.
61.
C. Srinivasa Kannan, P. P. Thomas, A. R. Balakrishnan, S. Subba Rao and Y. B. G. Varma, "A Model for Drying Kinetics in Fluidized Beds," Paper presented at the Indian Chemical Engineering Congress, Chemcon 93, Bombay, December 1993.
62.
A. R. Balakrishnan, "Instrumentation for Solar and Wind Data," Workshop on Instrumentation and Controls for Energy Auditing and Conservation in Buildings, Universiti Teknologi Malaysia, Johor Bahru, Malaysia, Dec. 7-9, 1993.
63.
C. Srinivasa Kannan, A. R. Balakrishnan and Y. B. G. Varma, "Suspended Particle Drying Systems," Journal of Energy, Heat and Mass Transfer, 15, 45-57 (1993).
64.
M. Sadasivam and A. R. Balakrishnan, "Effectiveness of Packed Bed Liquid Desiccant Systems for the Dehumidification of Air," Paper S-036, Session TP-IV, Indian Chemical Engineering Congress - Chemcon 92, Manipal, December 1992.
65.
A. R. Balakrishnan, "`Cool' Storage for Air-Conditioning Applications," Workshop on Environmental-ly Sound Technologies for the Heating and Cooling of Buildings, James Cook University of North Queensland, Townsville, Australia, September 1992.
66.
A. R. Balakrishnan, "Thermal Energy Storage in Heating of Buildings," Workshop on Environmental-ly Sound Technologies for the Heating and Cooling of Buildings, James Cook University of North Queensland, Townsville, Australia, September 1992.
67.
M. Sadasivam and A. R. Balakrishnan, "Effectiveness - NTU Method for Packed Bed Liquid Desiccant Dehumidifiers," Chemical Engineering Research and Design (Trans. I.Chem.E. London), 70, 572-577 (1992).
68.
K. B. Radhakrishnan and A. R. Balakrishnan, "Heat Transfer Analysis of Thermal Energy Storage using Phase Change Materials," Heat Recovery Systems and CHP,12, 427-435 (1992).
69.
P. Sivagnanam, A. R. Balakrishnan and Y. B. G. Varma, "Forced Convection Subcooled Boiling of Binary Mixtures," Canadian Journal of Chemical Engineering, 70, 42-47 (1992).
70.
M. Sadasivam and A. R. Balakrishnan, "Parametric Analysis of Effectiveness of Packed Bed Liquid Desiccant Dehumidifiers," Paper 5-6, Session HT-13B, Winter Annual Meeting, American Society of Mechanical Engineers, Atlanta, Ga., Dec. 1-6, 1991.
71.
A. R. Balakrishnan, "Building Design with Passive Systems," Workshop on Building Energy Management, Asian Institute of Technology, Bangkok, Thailand, April 1991.
72.
M. Sadasivam and A. R. Balakrishnan, "Analysis of Thermal Effects in Packed Bed Liquid Desiccant Dehumidifiers," Chemical Engineering and Processing, 30, 79-85 (1991).
73.
M. A. Salim, M. Sadasivam and A. R. Balakrishnan, "Transient Analysis of Heat Pump Assisted Distillation Systems - Part 2: Column and System Dynamics," International Journal of Energy Research, 15, 137-148 (1991).
74.
M. A. Salim, M. Sadasivam and A. R. Balakrishnan, "Transient Analysis of Heat Pump Assisted Distillation Systems - Part 1: The Heat Pump," International Journal of Energy Research, 15, 123-135 (1991).
75.
M. A. Salim and A. R. Balakrishnan, "Heat Pump Assisted Distillation," Paper presented at the Indian Chemical Engineering Congress - Chemcon 90, Varanasi, December 1990.
76.
A. R. Balakrishnan, "Solar Thermal Power Stations - A Techno-economic Feasibility Study," Seventh Asian School of Energy, Asian Institute of Technology, Bangkok, Thailand, January 1990.
77.
A. R. Balakrishnan, "Energy Storage - A Review," Seventh Asian School of Energy, Asian Institute of Technology, Bangkok, Thailand, January 1990.
78.
A. R. Balakrishnan and D. C. T. Pei, "Thermal Transport in Two-Phase Gas-Solid Suspension Flow Through Packed Beds," Powder Technology, 62, 51-57 (1990).
79.
V. C. Bhavsar and A. R. Balakrishnan, "Pebble Bed - Oil Thermal Energy Storage For Solar Thermo-Electric Power Systems," International Journal of Energy Research, 14, 233-240 (1990).
80.
V. C. Bhavsar and A. R. Balakrishnan, "Latent Heat Thermal Storage for Solar Thermo-Electric Power Systems," 9th Miami International Congress on Energy and Environment, Miami Beach, Florida, USA, December 1989.
81.
A. R. Balakrishnan and K. G. T. Hollands, "Spectrally Selective Surfaces for Solar Energy Applicati-ons," Regional Journal of Energy, Heat and Mass Transfer, 10, 261-268 (1989).
82.
A. R. Balakrishnan, "Energy Efficient Lighting and Daylighting," Workshop on Energy Conservation and Auditing of Commercial Buildings, Regional Centre for Energy, Heat and Mass Transfer for Asia and the Pacific, Madras, December 1988.
83.
A. R. Balakrishnan, "Passive Heating and Cooling of Buildings," Workshop on Energy Conservation and Auditing of Commercial Buildings, Regional Centre for Energy, Heat and Mass Transfer for Asia and the Pacific, Madras, December 1988.
84.
V. C. Bhavsar, A. K. Tiwari, U. B. Sahay and A. R. Balakrishnan, "Pebble Bed Thermal Storage Using Oil as Heat Transfer Medium," BHEL Report No. 8/NCES/81, BHEL, Hyderabad 93, India (1981).
85.
A. R. Balakrishnan and D. C. T. Pei, "Heat Transfer in Gas-Solid Packed Bed Systems - Part 3: Overall Heat Transfer Rates in Adiabatic Beds," Industrial and Engineering Chemistry, Process Design and Development, 18, 47-50 (1979).
86.
A. R. Balakrishnan and D. C. T. Pei, "Heat Transfer in Gas-Solid Packed Bed Systems - Part 2: The Conduction Mode," Industrial and Engineering Chemistry, Process Design and Development, 18, 40-46 (1979).
87.
A. R. Balakrishnan and D. C. T. Pei, "Heat Transfer in Gas-Solid Packed Bed Systems - Part 1: A Critical Review,"Industrial and Engineering Chemistry, Process Design and Development, 18, 30-40 (1979).
88.
E. C. Shewen, H. F. Sullivan, K. G. T. Hollands and A. R. Balakrishnan, "A Heat Storage Subsystem for Solar Energy," Solar Energy Project Report No. Stor-6, National Research Council of Canada, Ottawa, Canada (1978).
89.
A. R. Balakrishnan, K. G. T. Hollands, E. C. Shewen and P. Niessen, "Optimization Studies on Black Chrome Electroplating Variables for Solar Selective Surfaces," Paper 1-1-6, 4th Conference of the Solar Energy Society of Canada, London, Ontario, August 1978.
90.
A. R. Balakrishnan, H. F. Sullivan and K. G. T. Hollands, "Studies on the Effect of Bed Aspect Ratios and Pressure Drop on Flow Distribution in Rock Bed Storage Systems for Solar Energy Applications," Paper 1-3-1, 4th Conference of the Solar Energy Society of Canada, London, Ontario, August 1978.
91.
A. R. Balakrishnan, P. L. Silveston and H. F. Sullivan, "Use of Monolithic Structures for the Short Term Storage of Solar Energy," Paper 1122, Series 20, Session 22, Congress of the International Solar Energy Society, New Delhi, India, January 1978.
92.
A. R. Balakrishnan and D. C. T. Pei, "Convective Heat Transfer in Gas-Solid Suspension Flow Through Packed Beds," AIChE Journal, 24, 613-619 (1978).
93.
A. R. Balakrishnan, E. C. Shewen and J. F. Orgill, "Solar Energy Storage Systems," Waterloo Research Institute Report No. 77-05, May 1977.
94.
E. C. Shewen, A. R. Balakrishnan and J. F. Orgill, "Development of a Solar Air Heater," Waterloo Research Institute Report No. 77-04, May 1977.
95.
A. R. Balakrishnan, J. F. Orgill and E. C. Shewen, "Solar Air Collectors and Storage Subsystems," Waterloo Research Institute Report No. WRI 77-03, January 1977.
96.
P. L. Silveston, A. R. Balakrishnan and H. F. Sullivan, "Ordered Structures for the Storage of Solar Energy," Paper presented at the International Centre for Heat and Mass Transfer - Summer Seminar on Heat Transfer in Buildings, Dubrovnik, Yugoslavia, August 1977.
97.
A. R. Balakrishnan and D. C. T. Pei, "Prediction of Heat Transfer Rates in Packed Beds subject to Flowing Fluids," Paper 31c, 25th Canadian Chemical Engineering Conference, Montreal, November 1975.
98.
A. R. Balakrishnan and D. C. T. Pei, "Fluid-Particle Heat Transfer in Gas Fluidized Beds," Canadian Journal of Chemical Engineering, 53, 231-233 (1975).
99.
A. R. Balakrishnan and D. C. T. Pei, "Heat Transfer in Two Phase Gas-Solid Systems," Paper 24a, 24th Canadian Chemical Engineering Conference, Ottawa, October 1974.
100.
A. R. Balakrishnan and D. C. T. Pei, "Heat Transfer in Fixed Beds," Industrial and Engineering Chemistry, Process Design and Development, 13, 441-446 (1974).

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