Geodesic
Three gems in the theory of linear differential equations (in the work of A. A. Bolibrukh)
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 59 (2004) no. 6, pp. 1079-1091 
Yu. S. Ilyashenko. Three gems in the theory of linear differential equations (in the work of A. A. Bolibrukh). Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 59 (2004) no. 6, pp. 1079-1091. http://geodesic.mathdoc.fr/item/RM_2004_59_6_a4/
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Voir la notice de l'article provenant de la source Math-Net.Ru

Three classical results of A. A. Bolibrukh in the theory of linear systems with complex time are presented: the negative solution of the 21st Hilbert problem, sufficient conditions for this problem to have a positive solution, and sufficient conditions for the reducibility of a system with an irregular singular point to Birkhoff standard form.

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