Geodesic
Mobius transform for the linear ordinary differential equations
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 33, Tome 308 (2004), pp. 67-88 
A. Ya. Kazakov; Yu. N. Sirota. Mobius transform for the linear ordinary differential equations. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 33, Tome 308 (2004), pp. 67-88. http://geodesic.mathdoc.fr/item/ZNSL_2004_308_a4/
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     author = {A. Ya. Kazakov and Yu. N. Sirota},
     title = {Mobius transform for the linear ordinary differential equations},
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     year = {2004},
     volume = {308},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2004_308_a4/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

The Mobius transform for the linear ordinary differential equations of the second order is examined. It is shown, that this transform has some quasi-isospectral properties. Solutions of the Heun equation with one false singularity are constructed.

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