@article{DAN_1966_168_5_a6,
     author = {E. S. Levitin and B. T. Polyak},
     title = {Convergence of minimizing sequences in conditional extremum problems},
     journal = {Doklady Akademii Nauk},
     pages = {997--1000},
     publisher = {mathdoc},
     volume = {168},
     number = {5},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_168_5_a6/}
}