@article{abramowitz:1949:aes,
    author = {Abramowitz, Milton},
     title = {Asymptotic expansions of spheroidal wave functions},
   journal = {J. Math. Phys. Mass. Inst. Tech.},
    volume = {28},
      year = {1949},
     pages = {195–199},
   mrclass = {33.0X},
  mrnumber = {MR0032046 (11,245f)},
mrreviewer = {J. G. van der Corput},
     zblno = {0034.34001}}