@article{MM_1994_6_3_a6,
     author = {S. I. Agafonov},
     title = {Application of differential forms to construction of nonlocal symmetries},
     journal = {Matemati\v{c}eskoe modelirovanie},
     pages = {60--74},
     publisher = {mathdoc},
     volume = {6},
     number = {3},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MM_1994_6_3_a6/}
}