@article{DAN_1994_337_1_a3,
     author = {Yu. D. Pletner},
     title = {On partial differential equations that reduce to new classes of},
     journal = {Doklady Akademii Nauk},
     pages = {17--19},
     publisher = {mathdoc},
     volume = {337},
     number = {1},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1994_337_1_a3/}
}