@article{ZVMMF_1985_25_6_a1,
     author = {I. I. Gasanov and A. D. Rikun},
     title = {Necessary and sufficient conditions for single-extremality in nonconvex mathematical programming problems},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {815--826},
     publisher = {mathdoc},
     volume = {25},
     number = {6},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1985_25_6_a1/}
}