@article{MAN_1963__151_161089,
     author = {H. RUBEN},
     title = {A {Convergent} {Asymptotic} {Expansion} for {Mill's} {Ratio} and the {Normal} {Probability} {Integral} in {Terms} of {Rational} {Functions.}},
     journal = {Mathematische Annalen},
     pages = {355--364},
     publisher = {mathdoc},
     volume = {151},
     year = {1963},
     zbl = {0116.11503},
     url = {http://geodesic.mathdoc.fr/item/MAN_1963__151_161089/}
}