@article{ZNSL_1978_80_a1,
     author = {V. P. Il'in},
     title = {Approximation of functions from $B^\ell_{p,\theta}(G)$ by anisotropic averages},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {30--47},
     publisher = {mathdoc},
     volume = {80},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1978_80_a1/}
}