@incollection{olver:1994:gei,
    author = {Olver, F. W. J.},
    editor = {Zahar, R. V. M.},
     title = {The Generalized Exponential Integral},
    series = {International Series of Numerical Mathematics},
    volume = {119},
 booktitle = {Approximation and Computation (West Lafayette, IN, 1993)},
     pages = {497–510},
 publisher = {Birkh\"auser Boston},
   address = {Boston, MA},
      year = {1994},
   mrclass = {33B20 (34E05 41A60)},
  mrnumber = {MR1333639 (96i:33003)},
mrreviewer = {Richard B. Paris},
     zblno = {0821.33001}}