@article{FPM_2016_21_4_a2,
     author = {G. E. Ivanov and M. S. Lopushanski},
     title = {A separation theorem for nonconvex sets and its applications},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {23--66},
     publisher = {mathdoc},
     volume = {21},
     number = {4},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2016_21_4_a2/}
}