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@article{DE_1978_14_1_a3, author = {V. M. Isakov}, title = {Strictly hyperbolic diffraction problems}, journal = {Differencialʹnye uravneni\^a}, pages = {30--38}, publisher = {mathdoc}, volume = {14}, number = {1}, year = {1978}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1978_14_1_a3/} }
V. M. Isakov. Strictly hyperbolic diffraction problems. Differencialʹnye uravneniâ, Tome 14 (1978) no. 1, pp. 30-38. http://geodesic.mathdoc.fr/item/DE_1978_14_1_a3/