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A two-dimensional analog of the effect of approximation improvement near the ends of an interval. (English. Russian original) Zbl 0862.41025

Vestn. St. Petersbg. Univ., Math. 27, No. 3, 44-49 (1994); translation from Vestn. St-Peterbg. Univ., Ser. I 1994, No. 3, 54-59 (1994).
MSC:  41A63
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