@article{DAN_1967_173_2_a17,
     author = {M. R. Aliev and V. T. Aleksanyan},
     title = {Choice of $S$-functions in the method of contact transformations},
     journal = {Doklady Akademii Nauk},
     pages = {302--305},
     publisher = {mathdoc},
     volume = {173},
     number = {2},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_173_2_a17/}
}