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@article{TM_1966_92_a3, author = {K. K. Golovkin}, title = {Approximation of functions of the class $W_p^l(\Omega)$}, journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova}, pages = {50--56}, publisher = {mathdoc}, volume = {92}, year = {1966}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TM_1966_92_a3/} }
K. K. Golovkin. Approximation of functions of the class $W_p^l(\Omega)$. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Boundary value problems of mathematical physics. Part 4, Tome 92 (1966), pp. 50-56. http://geodesic.mathdoc.fr/item/TM_1966_92_a3/