Sivkova, E. O. Best recovery of the Laplace operator of a function and sharp inequalities. (English. Russian original) Zbl 1344.42023 J. Math. Sci., New York 209, No. 1, 130-137 (2015); translation from Fundam. Prikl. Mat. 18, No. 5, 175-185 (2013). MSC: 42B99 42B10 42B37 35R11 35J05 PDF BibTeX XML Cite \textit{E. O. Sivkova}, J. Math. Sci., New York 209, No. 1, 130--137 (2015; Zbl 1344.42023); translation from Fundam. Prikl. Mat. 18, No. 5, 175--185 (2013) Full Text: DOI OpenURL
Magaril-Il’yaev, G. G.; Osipenko, K. Yu. On best harmonic synthesis of periodic functions. (English. Russian original) Zbl 1336.65208 J. Math. Sci., New York 209, No. 1, 115-129 (2015); translation from Fundam. Prikl. Mat. 18, No. 5, 155-174 (2013). MSC: 65T40 42A16 PDF BibTeX XML Cite \textit{G. G. Magaril-Il'yaev} and \textit{K. Yu. Osipenko}, J. Math. Sci., New York 209, No. 1, 115--129 (2015; Zbl 1336.65208); translation from Fundam. Prikl. Mat. 18, No. 5, 155--174 (2013) Full Text: DOI OpenURL