@article{ZVMMF_2007_47_7_a2,
     author = {I. S. Litvinchev},
     title = {Refinement of {Lagrangian} bounds in optimization problems},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1151--1157},
     publisher = {mathdoc},
     volume = {47},
     number = {7},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2007_47_7_a2/}
}