1. ASHRAE, “ASHRAE Hand Book of Fundamental,” Chap. 29, 1977, p. 11.
2. R. W. Dickerson, “The Freezing Preservation of Foods,” 4th Ed., Vol. 2, ed. by D. K. Tressler, W. B. Arsdel and M. J. Copley, AVI Publishing Co., Westport, Conn., 1968, p. 26.
3. H. S. Carslaw and J. C. Jaeger, “Conduction of Heat in Solid,” 2nd Ed., Clarendon Press, Oxford, 1959, p. 50.
4. G. D. Smith, “Numerical Solution of Partial Differential Equations,” 1st Ed., Clarendon Press, Oxford, 1965, p. 20.
5. D. J. Wilde, “Optimum Seaking Methods,” Prentice-Hall, Inc., Englewood Cliffs, N.Y. 1964, p. 32.