![PDF] Simplified Calculation of Ei(x) for Positive Arguments, and a Short Table of Shi(x)* | Semantic Scholar PDF] Simplified Calculation of Ei(x) for Positive Arguments, and a Short Table of Shi(x)* | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/4fed0838d7541433533577250ed4f8f26553fcf5/2-Table1-1.png)
PDF] Simplified Calculation of Ei(x) for Positive Arguments, and a Short Table of Shi(x)* | Semantic Scholar
Solving the Schrödinger equation of helium and its isoelectronic ions with the exponential integral (Ei) function in the free iterative complement interaction method - Physical Chemistry Chemical Physics (RSC Publishing)
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