@article{DE_1986_22_3_a22,
     author = {I. F. Boretskii},
     title = {Integrability of a problem of anisotropic {Boltyanskiǐ} relativity},
     journal = {Differencialʹnye uravneni\^a},
     pages = {539--541},
     year = {1986},
     volume = {22},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_3_a22/}
}