@article{fedoryuk:1991:aot,
    author = {Fedoryuk, M. V.},
     title = {Asymptotics of the spectrum of the {H}eun equation and of
              {H}eun functions},
   journal = {Izv. Akad. Nauk SSSR Ser. Mat.},
  fjournal = {Izvestiya Akademii Nauk SSSR. Seriya Matematicheskaya},
    volume = {55},
      year = {1991},
    number = {3},
     pages = {631–646},
      note = {In Russian. English translation: Math. USSR-Izv., {\bf 38}(1992),
              no. 3, pp. 621–635 (1992)},
  language = {Russian},
      issn = {0373-2436},
   mrclass = {34A20 (33E30 34B30 34L20)},
  mrnumber = {MR1129829 (93d:34003)},
mrreviewer = {Andre{\u\i} Bolibrukh},
       doi = {10.1070/IM1992v038n03ABEH002217},
     zblno = {0742.34004}}