@article{ZVMMF_1973_13_4_a5,
     author = {L. G. Gurin},
     title = {Sufficient conditions for a local minimum},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {873--884},
     publisher = {mathdoc},
     volume = {13},
     number = {4},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1973_13_4_a5/}
}