@article{DE_1972_8_10_a20,
     author = {N. A. Ivanov},
     title = {The almost differentiability with respect to parameters of the solutions of a system of first order ordinary differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1882--1885},
     publisher = {mathdoc},
     volume = {8},
     number = {10},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_10_a20/}
}