@article{IVM_1980_4_a2,
     author = {Ya. Valashek},
     title = {Imbedding theorems and inequalities of various metrics for best approximations with respect to the {Haar} system},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {11--15},
     publisher = {mathdoc},
     number = {4},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1980_4_a2/}
}