@article{SM_1967_3_2_a2,
     author = {A. D. Myshkis and A. M. Samoilenko},
     title = {Systems with shocks at prescribed instants of time},
     journal = {Sbornik. Mathematics},
     pages = {187--193},
     publisher = {mathdoc},
     volume = {3},
     number = {2},
     year = {1967},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1967_3_2_a2/}
}