@article{VMUMM_1995_5_a0,
     author = {V. V. Filippov},
     title = {On upper and lower solutions of the differential inclusion},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {3--10},
     year = {1995},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1995_5_a0/}
}