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@article{JRAM_1960__205_150452, author = {R.P. Gilbert}, title = {Singularities of {Solutions} to the {Wave} {Equation} in {Three} {Dimensions.}}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {75--81}, publisher = {mathdoc}, volume = {205}, year = {1960}, zbl = {0099.07901}, url = {http://geodesic.mathdoc.fr/item/JRAM_1960__205_150452/} }
R.P. Gilbert. Singularities of Solutions to the Wave Equation in Three Dimensions.. Journal für die reine und angewandte Mathematik, Tome 205 (1960), pp. 75-81. http://geodesic.mathdoc.fr/item/JRAM_1960__205_150452/