@article{DAN_1975_223_1_a9,
     author = {S. Ya. L'vin},
     title = {On a class of degenerate differential equations of higher order},
     journal = {Doklady Akademii Nauk},
     pages = {42--45},
     publisher = {mathdoc},
     volume = {223},
     number = {1},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_223_1_a9/}
}