@article{bay:1997:aco,
    author = {Bay, Karlheinz and Lay, Wolfgang and Akopyan, Alexey},
     title = {Avoided crossings of the quartic oscillator},
   journal = {J. Phys. A},
  fjournal = {Journal of Physics. A. Mathematical and General},
    volume = {30},
      year = {1997},
    number = {9},
     pages = {3057–3067},
      issn = {0305-4470},
     coden = {JPHAC5},
   mrclass = {81Q05},
  mrnumber = {MR1456898 (98e:81025)},
mrreviewer = {Gabriel Alvarez},
       doi = {10.1088/0305-4470/30/9/017},
     zblno = {0917.34072}}