@article{olver:1965:asy,
    author = {Olver, F. W. J.},
     title = {On the asymptotic solution of second-order differential
              equations having an irregular singularity of rank one, with an
              application to {W}hittaker functions},
   journal = {J. Soc. Indust. Appl. Math. Ser. B Numer. Anal.},
    volume = {2},
      year = {1965},
    number = {2},
     pages = {225–243},
   mrclass = {41.50 (33.00)},
  mrnumber = {MR0185350 (32 \#2818)},
mrreviewer = {T. E. Hull},
       doi = {10.1137/0702017},
     zblno = {0173.33901}}