@article{MZM_1967_1_1_a3,
     author = {A. A. Blyusin},
     title = {On an extremum problem},
     journal = {Matemati\v{c}eskie zametki},
     pages = {25--34},
     publisher = {mathdoc},
     volume = {1},
     number = {1},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1967_1_1_a3/}
}