@article{DE_1998_34_2_a2,
     author = {Kh. G. Guseinov and V. N. Ushakov},
     title = {On infinitesimal constructions in the theory of generalized dynamical {systems.~I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {157--165},
     publisher = {mathdoc},
     volume = {34},
     number = {2},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1998_34_2_a2/}
}