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@article{MZ_1959__71_169808, author = {Philip Hartman}, title = {On solutions of {...V+V} = 0 in an exterior region.}, journal = {Mathematische Zeitschrift}, pages = {251--257}, publisher = {mathdoc}, volume = {71}, year = {1959}, zbl = {0092.31402}, url = {http://geodesic.mathdoc.fr/item/MZ_1959__71_169808/} }
Philip Hartman. On solutions of ...V+V = 0 in an exterior region.. Mathematische Zeitschrift, Tome 71 (1959), pp. 251-257. http://geodesic.mathdoc.fr/item/MZ_1959__71_169808/