@article{INTA_1974_11_a4,
     author = {V. I. Bliznikas and Z. Yu. Lupeikis},
     title = {The geometry of differential equations},
     journal = {Itogi Nauki i Tekhniki. Seriya Algebra. Geometriya. Topologiya},
     pages = {209--259},
     year = {1974},
     volume = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTA_1974_11_a4/}
}