1. P. Appel’, Theoretical Mechanics, Vol. 1 (Fizmatlit, Moscow, 1960) [in Russian].
2. D. R. Merkin, Introduction to Mechanics of Flexible Thread (Nauka, Moscow, 1980) [in Russian].
3. F. Paul Byrd and Morris Friedman, Handbook of Elliptic Integrals (Springer, B:, 1954).
4. G. Beitmen and A. Erdeii, Higher Transcendental Functions. Elliptic and Automorphic Functions. Functions of Lame and Mathieu (Ser. reference math. library) (Nauka, Moscow, 1967) [in Russian].
5. G. Beitmen and A. Erdeii, Higher Transcendental Functions (McGraw-Hill, N.Y., Toronto, L., 1955).