Geodesic
Approximate Values of the Integral Logarithm and the Exponential Integral Function
Mathematica balkanica, Tome 14 (2000) no. 1-2, p. 141 
R. Krastev. Approximate Values of the Integral Logarithm and the Exponential Integral Function. Mathematica balkanica, Tome 14 (2000) no. 1-2, p. 141. http://geodesic.mathdoc.fr/item/MABA_2000_14_1-2_a11/
@article{MABA_2000_14_1-2_a11,
     author = {R. Krastev},
     title = {Approximate {Values} of the {Integral} {Logarithm} and the {Exponential} {Integral} {Function}},
     journal = {Mathematica balkanica},
     pages = {141},
     year = {2000},
     volume = {14},
     number = {1-2},
     url = {http://geodesic.mathdoc.fr/item/MABA_2000_14_1-2_a11/}
}
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