@article{DE_1992_28_4_a0,
     author = {M. U. Akhmetov and N. A. Perestyuk},
     title = {Differential properties of solutions and integral surfaces of nonlinear impulse systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {555--566},
     publisher = {mathdoc},
     volume = {28},
     number = {4},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1992_28_4_a0/}
}