@article{DE_1972_8_7_a23,
     author = {D. U. Umbetzhanov},
     title = {On the construction of a multiperiodic solution of a certain system of partial differential equations with a common principal part},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1326--1329},
     publisher = {mathdoc},
     volume = {8},
     number = {7},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_7_a23/}
}