@article{MZM_1999_66_1_a8,
     author = {A. F. Izmailov},
     title = {Optimality conditions in extremal problems with nonregular inequality constraints},
     journal = {Matemati\v{c}eskie zametki},
     pages = {89--101},
     year = {1999},
     volume = {66},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1999_66_1_a8/}
}