1. 1. H. J. Stewart, Proc. Nat. Acad. Sci. U.S.A. vol. 26 (1940) p. 604.
2. 2. C. G. Rosby, Journal of Marine Research vol. 2 (1939) p. 38.
3. 3. B. Haurwitz, Journal of Marine Research vol. 3 (1940) p. 255.
4. Cambridge Mathematical Library;Lamb, Horace,1993
5. 5. A. Grey, G. B. Mathews and T. M. MacRobert, Bessel Functions, London, 1931.