Geodesic
Meromorphic Transformation to the Birkhoff Standard Form in Small Dimensions
Informatics and Automation, Solitons, geometry, and topology: on the crossroads, Tome 225 (1999), pp. 87-95.

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

It is proved that every system of 4 or 5 linear differential equations with two irreducible blocks in a neighborhood of an irregular singular point can be transformed to the Birkhoff standard form with the help of a meromorphic transformation which does not increase the Poincaré rank of the singularity. 
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A. A. Bolibrukh. Meromorphic Transformation to the Birkhoff Standard Form in Small Dimensions. Informatics and Automation, Solitons, geometry, and topology: on the crossroads, Tome 225 (1999), pp. 87-95. http://geodesic.mathdoc.fr/item/TRSPY_1999_225_a5/

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