@article{ZVMMF_1995_35_4_a4,
     author = {A. M. Bagirov and A. A. Gasanov},
     title = {A method of approximating a quasidifferential},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {511--519},
     year = {1995},
     volume = {35},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1995_35_4_a4/}
}