Improvement of extension operators by means of approximation operators that preserve boundary values
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Investigations in the theory of differentiable functions of many variables and its applications. Part 11, Tome 173 (1986), pp. 50-54.

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     author = {V. I. Burenkov and E. M. Popova},
     title = {Improvement of extension operators by means of approximation operators that preserve boundary values},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {50--54},
     publisher = {mathdoc},
     volume = {173},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1986_173_a4/}
}
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V. I. Burenkov; E. M. Popova. Improvement of extension operators by means of approximation operators that preserve boundary values. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Investigations in the theory of differentiable functions of many variables and its applications. Part 11, Tome 173 (1986), pp. 50-54. http://geodesic.mathdoc.fr/item/TM_1986_173_a4/