1. W. S. Minkler and W. T. Rouleau, The effects of internal heat generation on heat transfer in thin fins, Nucl. Sci. Enqng 7,400~406 (1960). 2. G. B. Melese and J. E. Wilkins, Efficiency of longitudinal fins of arbitrary shape with nonuniform surface heat transfer and internal heat generation, in Proceedings Third International Heat Trksfer Conference, Vol. Iii, DD. 272-280. A.1.Ch.E.. New York (19661. 3. G. Ahmadi and A. Raiani, Some dptimisation problems related to cooling fins, Int. J. Heat Mass Transfer 16, 2369-2375 (1973). 4. A. Aziz and S. M. Enamul Huq, Perturbation solution for convecting fin with variable thermal conductivity, J. Heat Transfer 97C, 300-301 (1975). 5. R. J. Krane, Discussion on a previously published paper by A. Aziz and S. M. Enamul Huq, J. Heat Transfer. FIG. 2. Optimisation chart for rectangular fin with uniform To be published. internal heat generation and temperature dependent thermal 6. D. Q. Kern and A. D. Kraus, Extended Surface Heat conductivity. Transfer, pp. 193-199. McGraw-Hill, New York (1972).