Geodesic
Asymptotics of the spectrum of Heun's equation and of Heun's functions
Izvestiya. Mathematics , Tome 38 (1992) no. 3, pp. 621-635

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New classes of Heun's functions that are eigenfunctions of a two-parameter spectral problem with boundary conditions at singular points of Heun's equation are introduced. The asymptotics of the spectrum and of Heun's functions are studied. 
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     author = {M. V. Fedoryuk},
     title = {Asymptotics of the spectrum of {Heun's} equation and of {Heun's} functions},
     journal = {Izvestiya. Mathematics },
     pages = {621--635},
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     number = {3},
     year = {1992},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1992_38_3_a8/}
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M. V. Fedoryuk. Asymptotics of the spectrum of Heun's equation and of Heun's functions. Izvestiya. Mathematics , Tome 38 (1992) no. 3, pp. 621-635. http://geodesic.mathdoc.fr/item/IM2_1992_38_3_a8/