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@article{DAN_1981_256_6_a5, author = {G. M. Kagan}, title = {On a class of singular problems satisfying {Huygens} principle}, journal = {Doklady Akademii Nauk}, pages = {1307--1311}, publisher = {mathdoc}, volume = {256}, number = {6}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1981_256_6_a5/} }
G. M. Kagan. On a class of singular problems satisfying Huygens principle. Doklady Akademii Nauk, Tome 256 (1981) no. 6, pp. 1307-1311. http://geodesic.mathdoc.fr/item/DAN_1981_256_6_a5/