@article{DAN_1995_341_4_a0,
     author = {S. K. Vodopyanov and A. D.-O. Ukhlov},
     title = {Weakly contact transformations and change of variables on},
     journal = {Doklady Akademii Nauk},
     pages = {439--441},
     publisher = {mathdoc},
     volume = {341},
     number = {4},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1995_341_4_a0/}
}