@article{MZM_1982_32_6_a7,
     author = {A. P. Buslaev and G. G. Magaril-Il'yaev and V. M. Tikhomirov},
     title = {Existence of extremal functions in inequalities for derivatives},
     journal = {Matemati\v{c}eskie zametki},
     pages = {823--834},
     publisher = {mathdoc},
     volume = {32},
     number = {6},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1982_32_6_a7/}
}