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@article{AM2_1994__48_2-3_137608, author = {Henrik Stetkaer}, title = {D'Alembert's equation and spherical functions.}, journal = {Aequationes mathematicae}, pages = {220--227}, publisher = {mathdoc}, volume = {48}, number = {2-3}, year = {1994}, zbl = {0810.39008}, url = {http://geodesic.mathdoc.fr/item/AM2_1994__48_2-3_137608/} }
Henrik Stetkaer. D'Alembert's equation and spherical functions.. Aequationes mathematicae, Tome 48 (1994) no. 2-3, pp. 220-227. http://geodesic.mathdoc.fr/item/AM2_1994__48_2-3_137608/