MathSciNet bibliographic data MR474705 65D20 Sharma, R. R.; Zohuri, Bahman A general method for an accurate evaluation of exponential integrals \$E\sb{1}(x), x>0\$$E\sb{1}(x), x>0$. J. Computational Phys. 25 (1977), no. 2, 199–204. Links to the journal or article are not yet available

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