@article{ZVMMF_1990_30_6_a1,
     author = {R. Lepp},
     title = {Discrete approximation of extremal problems with operator inequality constraints},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {817--825},
     year = {1990},
     volume = {30},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1990_30_6_a1/}
}