@article{SEMR_2006_3_a3,
     author = {G. A. Akishev},
     title = {On degrees of approximation of some classes by polynomials with respect to generalized {Haar} system},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {92--105},
     year = {2006},
     volume = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2006_3_a3/}
}