@article{VMUMM_1985_6_a7,
     author = {A. F. Filippov},
     title = {Singular points of differential inclusions in the plane},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {46--52},
     year = {1985},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1985_6_a7/}
}