@article{DAN_1970_191_1_a11,
     author = {\`E. V. Gaushus},
     title = {Bifurcation theory of point transformations},
     journal = {Doklady Akademii Nauk},
     pages = {43--46},
     publisher = {mathdoc},
     volume = {191},
     number = {1},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_191_1_a11/}
}