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@article{DAN_1969_186_4_a15, author = {V. I. Koroza}, title = {A variation method for wave propagation boundary value problem}, journal = {Doklady Akademii Nauk}, pages = {795--798}, publisher = {mathdoc}, volume = {186}, number = {4}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1969_186_4_a15/} }
V. I. Koroza. A variation method for wave propagation boundary value problem. Doklady Akademii Nauk, Tome 186 (1969) no. 4, pp. 795-798. http://geodesic.mathdoc.fr/item/DAN_1969_186_4_a15/