@article{INTM_1989_27_a1,
     author = {A. V. Arutyunov},
     title = {Perturbations of extremal problems with constraints, and necessary conditions for optimality},
     journal = {Itogi nauki i tehniki. Seri\^a, Matemati\v{c}eskij analiz},
     pages = {147--235},
     year = {1989},
     volume = {27},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTM_1989_27_a1/}
}