@article{IM2_1993_41_1_a1,
     author = {V. Z. Belen'kii},
     title = {Sufficient optimality conditions for linear differential inequalities with discontinuous trajectories},
     journal = {Izvestiya. Mathematics },
     pages = {39--54},
     publisher = {mathdoc},
     volume = {41},
     number = {1},
     year = {1993},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1993_41_1_a1/}
}