%0 Journal Article %A M. R. Aliev %A V. T. Aleksanyan %T Choice of $S$-functions in the method of contact transformations %J Doklady Akademii Nauk %D 1967 %P 302-305 %V 173 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1967_173_2_a17/ %G ru %F DAN_1967_173_2_a17