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

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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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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/