Geodesic
The approximation of sobolev classes of functions by sums of products of functions of fewer variables
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Theory of functions and related questions of analysis, Tome 180 (1987), pp. 30-32.

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@article{TM_1987_180_a8,
     author = {M.-B. Babayev},
     title = {The approximation of sobolev classes of functions by sums of products of functions of fewer variables},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {30--32},
     publisher = {mathdoc},
     volume = {180},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1987_180_a8/}
}
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M.-B. Babayev. The approximation of sobolev classes of functions by sums of products of functions of fewer variables. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Theory of functions and related questions of analysis, Tome 180 (1987), pp. 30-32. http://geodesic.mathdoc.fr/item/TM_1987_180_a8/