@article{lay:1998:aan,
    author = {Lay, W. and Bay, K. and Slavyanov, S. {\relax{Yu}}.},
     title = {Asymptotic and numeric study of eigenvalues of the double
              confluent {H}eun equation},
   journal = {J. Phys. A},
  fjournal = {Journal of Physics. A. Mathematical and General},
    volume = {31},
      year = {1998},
    number = {42},
     pages = {8521–8531},
      issn = {0305-4470},
     coden = {JPHAC5},
   mrclass = {34A20 (34B05 34E05 65L15)},
  mrnumber = {MR1654350 (99g:34020)},
       doi = {10.1088/0305-4470/31/42/011},
     zblno = {0949.34069}}