@article{IVM_2005_3_a1,
     author = {G. A. Akishev},
     title = {On orders of approximation of function classes by polynomials in the generalized {Haar} system},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {13--22},
     publisher = {mathdoc},
     number = {3},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2005_3_a1/}
}