Kornejchuk, N. P.; Lushpaj, N. E. Best quadrature formulas for classes of differentiable functions and piecewise-polynomial approximation. (English) Zbl 0209.09802 Math. USSR, Izv. 3(1969), 1335-1355 (1971). MSC: 41A55 41A50 PDF BibTeX XML Cite \textit{N. P. Kornejchuk} and \textit{N. E. Lushpaj}, Math. USSR, Izv. 3, 1335--1355 (1971; Zbl 0209.09802) Full Text: DOI
Kornejchuk, N. P.; Lushpaj, N. E. Beste Quadraturformeln für Klassen differenzierbarer Funktionen und stückweise polynomiale Approximation. (Russian) Zbl 0198.08902 Izv. Akad. Nauk SSSR, Ser. Mat. 33, 1416-1437 (1969). PDF BibTeX XML Cite \textit{N. P. Kornejchuk} and \textit{N. E. Lushpaj}, Izv. Akad. Nauk SSSR, Ser. Mat. 33, 1416--1437 (1969; Zbl 0198.08902)