1. A. Ya. Kazakov, “Integral symmetries, integral invariants, and monodromy matrices for ordinary differential equations”, Theoret. and Math. Phys., 116:3 (1998), 991–1000  mathnet  mathnet  crossref  crossref  isi
  2. N. A. Veshev, “Degeneration of solutions of Heun's equation under fusion of singularities”, Theoret. and Math. Phys., 110:2 (1997), 179–182  mathnet  crossref  crossref  mathscinet  zmath  isi
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