Geodesic
Integral symmetries, integral invariants, and monodromy matrices for ordinary differential equations
Teoretičeskaâ i matematičeskaâ fizika, Tome 116 (1998) no. 3, pp. 323-335

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We consider the transfer and monodromy matrices for the degenerate Heun equation. We use an auxiliary ordinary third-order linear differential equation that is “stable” under the integral Euler transformation. We find the invariant of this transformation and express it via the transfer matrix element. 
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     author = {A. Ya. Kazakov},
     title = {Integral symmetries, integral invariants, and monodromy matrices for ordinary differential equations},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {323--335},
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     volume = {116},
     number = {3},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1998_116_3_a0/}
}
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A. Ya. Kazakov. Integral symmetries, integral invariants, and monodromy matrices for ordinary differential equations. Teoretičeskaâ i matematičeskaâ fizika, Tome 116 (1998) no. 3, pp. 323-335. http://geodesic.mathdoc.fr/item/TMF_1998_116_3_a0/