1. Addition theorems for spherical wave functions;Stein, Seymour;Quart. Appl. Math.,1961
2. Addition theorems for spherical wave functions;Stein, Seymour;Quart. Appl. Math.,1961
3. S. Stein, Ibid., p. 33
4. Translational addition theorems for spherical vector wave functions;Cruzan, Orval R.;Quart. Appl. Math.,1962
5. J. A. Stratton, Electromagnetic theory, McGraw-Hill Book Co., Inc., New York, N. Y., 1941, pp. 392–423