MathSciNet bibliographic data MR283460 41.17 Verbeeck, Paul Rational approximations for exponential integrals \$E\sb{n}\,(x)\$$E\sb{n}\,(x)$. Acad. Roy. Belg. Bull. Cl. Sci. (5) 56 1970 1064–1072. Links to the journal or article are not yet available

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