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@article{DE_1984_20_2_a13, author = {A. A. Borgardt and D. Ya. Karpenko}, title = {Characteristic problem for the massive wave equation}, journal = {Differencialʹnye uravneni\^a}, pages = {302--308}, publisher = {mathdoc}, volume = {20}, number = {2}, year = {1984}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1984_20_2_a13/} }
A. A. Borgardt; D. Ya. Karpenko. Characteristic problem for the massive wave equation. Differencialʹnye uravneniâ, Tome 20 (1984) no. 2, pp. 302-308. http://geodesic.mathdoc.fr/item/DE_1984_20_2_a13/