@article{TM_1983_164_a7,
     author = {V. A. Popov and V. Kh. Khristov},
     title = {Averaged moduli of smoothness for functions of several variables and function spaces generated by them},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {136--141},
     publisher = {mathdoc},
     volume = {164},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1983_164_a7/}
}