@article{INTG_1980_11_a2,
     author = {A. M. Vinogradov},
     title = {The geometry of nonlinear differential equations},
     journal = {Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara},
     pages = {89--134},
     publisher = {mathdoc},
     volume = {11},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTG_1980_11_a2/}
}