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@article{DE_1968_4_1_a4, author = {A. M. Nakhushev}, title = {A three-dimensional analog of {Gellerstedt's} problem}, journal = {Differencialʹnye uravneni\^a}, pages = {52--62}, publisher = {mathdoc}, volume = {4}, number = {1}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1968_4_1_a4/} }
A. M. Nakhushev. A three-dimensional analog of Gellerstedt's problem. Differencialʹnye uravneniâ, Tome 4 (1968) no. 1, pp. 52-62. http://geodesic.mathdoc.fr/item/DE_1968_4_1_a4/