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3. Canuto, V.: 1970,Astrophys J. Letters 160, L153.
4. Sokolov, A. A. and Ternov, I. M.: 1968,Synchrotron Radiation, Pergamon Press, N. Y., p. 67. In terms of an alternate form of the associated Laguerre polynomials (L λ k )) theI ns areI ns (ξ2)=ξ n−s L n n−s (ξ2),n>s;I ns (ξ2)=ξ s−n L n n−s (ξ2),s>n.See Quantum Mechanics by L. Landau, and E. M. Lifshitz, Pergamon Press, London (1958), p. 499.
5. Loudon, R.: 1959,Amer. J. Phys. 27, 649.