@article{VSPUI_2018_14_1_a2,
     author = {J. Grzybowski and D. Pallaschke and R. Urba\'nski},
     title = {The quasidifferential calculus, separation of convex sets and the {Demyanov} difference},
     journal = {Vestnik Sankt-Peterburgskogo universiteta. Prikladna\^a matematika, informatika, processy upravleni\^a},
     pages = {20--30},
     year = {2018},
     volume = {14},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/VSPUI_2018_14_1_a2/}
}