@article{DE_1989_25_3_a9,
     author = {E. M. Vorob'ev},
     title = {Partial symmetries and integrable multidimensional differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {461--465},
     year = {1989},
     volume = {25},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_3_a9/}
}