1. Abramowitz , M. ,and I.A.Stegun , ed. 1972 ,Handbook of mathematical functions with formulas, graphs, and mathematical tables, p. 260 , Dover Pub.Inc. , New York .
2. Spectral methods in edge-diffraction theories
3. Bateman , H. 1955 ,Electrical and Optical Wave-Motion, pp. 4 – 5 , Dover Pub.Inc. , New York .