Marshak, A. L. On the approximation of the exponential integral by quadrature formulae. (English) Zbl 0522.65007 U.S.S.R. Comput. Math. Math. Phys. 22, No. 5, 20-28 (1982). MSC: 65D20 33B15 PDF BibTeX XML Cite \textit{A. L. Marshak}, U.S.S.R. Comput. Math. Math. Phys. 22, No. 5, 20--28 (1982; Zbl 0522.65007) Full Text: DOI
Marshak, A. L. On the approximation of the integral exponential function with the help of quadrature formulae. (Russian) Zbl 0513.65010 Zh. Vychisl. Mat. Mat. Fiz. 22, No. 5, 1044-1051 (1982). MSC: 65D20 65D32 33B10 PDF BibTeX XML Cite \textit{A. L. Marshak}, Zh. Vychisl. Mat. Mat. Fiz. 22, 1044--1051 (1982; Zbl 0513.65010)