1. Takeuti, Y.: Bulletin of JSME10, 423 (1967).
2. Carslaw, H. S., andJ. C. Jaeger: Conduction of Heat in Solids. Oxford University Press. 1959.
3. Lekhnitskii, S. G.: Theory of Elasticity of an Anisotropic Elastic Body. San Francisco: Holden-Day Inc. 1963.