@article{IVM_2003_5_a3,
     author = {S. Ya. Serovaǐskiǐ},
     title = {Lower augmentation and extension of extremal problems},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {30--41},
     publisher = {mathdoc},
     number = {5},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2003_5_a3/}
}