1. "Theory of Elasticity," by S. Timoshenko,1931, McGraw-Hill Publishing Co., Inc., New York, N. Y., pp.203212,
2. "Heat Transmission," by W. H. McAdams,1912, McGraw-Hill Publishing Co., Inc., New York, N. Y., pp.3235.
3. ''Operational Methods in Applied Mathematics," by H. S. Carslaw and J. C. Jaeger, 1948, Oxford Press, London, pp.271-279.