@article{INTM_1982_20_a0,
     author = {A. B. Vasil'eva and M. G. Dmitriev},
     title = {Singular perturbations in problems of optimal control},
     journal = {Itogi nauki i tehniki. Seri\^a, Matemati\v{c}eskij analiz},
     pages = {3--77},
     publisher = {mathdoc},
     volume = {20},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTM_1982_20_a0/}
}