The approximation of sobolev classes of functions by sums of products of functions of fewer variables
Informatics and Automation, Theory of functions and related questions of analysis, Tome 180 (1987), pp. 30-32.

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     author = {M.-B. Babayev},
     title = {The approximation of sobolev classes of functions by sums of products of functions of fewer variables},
     journal = {Informatics and Automation},
     pages = {30--32},
     publisher = {mathdoc},
     volume = {180},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_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. Informatics and Automation, Theory of functions and related questions of analysis, Tome 180 (1987), pp. 30-32. http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a8/