@article{DAN_1989_304_2_a7,
     author = {M. S. Nikol'skii},
     title = {The maximum principle in a nonsmooth minimax problem of optimal},
     journal = {Doklady Akademii Nauk},
     pages = {294--297},
     publisher = {mathdoc},
     volume = {304},
     number = {2},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_304_2_a7/}
}