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@article{DAN_1979_245_4_a15, author = {L. A. Ivanov}, title = {Huygens principle for equations dissociating into factors}, journal = {Doklady Akademii Nauk}, pages = {829--832}, publisher = {mathdoc}, volume = {245}, number = {4}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1979_245_4_a15/} }
L. A. Ivanov. Huygens principle for equations dissociating into factors. Doklady Akademii Nauk, Tome 245 (1979) no. 4, pp. 829-832. http://geodesic.mathdoc.fr/item/DAN_1979_245_4_a15/