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2. G. Bateman and A. Erdelyi, Higher Transcendental Functions. Legendre Functions [Russian translation], Nauka, Moscow (1965).
3. G. N. Watson, Theory of Bessel Functions, CUP, New York (1944).
4. A. F. Verlan' and V. S. Sizikov, Methods of Computer Solution of Integral Equations [in Russian], Naukova Dumka, Kiev (1978).
5. A. S. Vol'mir, Stability of Deformable Systems [in Russian], Nauka, Moscow (1967).