@article{DAN_1990_310_2_a17,
     author = {S. V. Khabirov},
     title = {Application of contact transformations of the inhomogeneous},
     journal = {Doklady Akademii Nauk},
     pages = {333--336},
     year = {1990},
     volume = {310},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_310_2_a17/}
}