@article{DAN_1989_304_3_a3,
     author = {N. A. Bogatyreva and E. S. Pyatnitskii},
     title = {The minimax principle of mechanics and its application to optimal},
     journal = {Doklady Akademii Nauk},
     pages = {533--537},
     publisher = {mathdoc},
     volume = {304},
     number = {3},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_304_3_a3/}
}