Geodesic
Isomonodromy deformations of equations with irregular singularities
Sbornik. Mathematics, Tome 71 (1992) no. 2, pp. 463-479

Voir la notice de l'article provenant de la source Math-Net.Ru

Necessary and sufficient conditions are obtained for a deformation to be isomonodromic for higher-order systems and equations in a neighborhood of an irregular singular point in the case when all formal solutions are subnormal series. Examples are considered. 
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     author = {M. V. Fedoryuk},
     title = {Isomonodromy deformations of equations with irregular singularities},
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     number = {2},
     year = {1992},
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M. V. Fedoryuk. Isomonodromy deformations of equations with irregular singularities. Sbornik. Mathematics, Tome 71 (1992) no. 2, pp. 463-479. http://geodesic.mathdoc.fr/item/SM_1992_71_2_a12/