1. A Treatise on the Mathematical Theory of Elasticity, Fourth Edition. Dover, New York, 1944, p. 193.
2. Structural Re;Thompson,1969
3. and , Differential and Integral Equations of Mathematical Physics, Chapter XII, by (Russian edition only), ONTI, Moscow/Leningrad 1937.
4. and , On the Application of a New Method of Investigation of the Elastic Vibrations in the Space with Axial Symmetry, Trud. Inst. Seism. Akad. Nauk SSR 29 (1933).