@article{DAN_1993_330_6_a8,
     author = {V. V. Filippov},
     title = {Families of changes of variables and a uniqueness theorem for},
     journal = {Doklady Akademii Nauk},
     pages = {704--706},
     year = {1993},
     volume = {330},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_330_6_a8/}
}