@article{DE_1966_2_9_a0,
     author = {V. A. Pliss},
     title = {On the theory of invariant surfaces},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1139--1150},
     publisher = {mathdoc},
     volume = {2},
     number = {9},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1966_2_9_a0/}
}