@article{fettis:1976:cro,
    author = {Fettis, Henry E.},
     title = {Complex roots of $\sin z=az$, $\cos z =az$, and $\cosh z=az$},
   journal = {Math. Comp.},
    volume = {30},
      year = {1976},
    number = {135},
     pages = {541–545},
   mrclass = {65A05},
  mrnumber = {MR0418401 (54 \#6442)},
mrreviewer = {Gerhard Merz},
     links = {\URL[FullText]{http://links.jstor.org/sici?sici=0025-5718%28197607%2930%3A135%3C541%3ACROA%3E2.0.CO%3B2-C}},
     zblno = {0332.65031}}