@article{DE_1989_25_7_a27,
     author = {R. P. Malayshka},
     title = {Symmetries of the {Birkhoff} equations, and conservation laws},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1275--1277},
     publisher = {mathdoc},
     volume = {25},
     number = {7},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_7_a27/}
}