Geodesic
Two problems in the Galois theory of differential fields for the field of formal power series
Sbornik. Mathematics, Tome 37 (1980) no. 3, pp. 327-335

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The direct problem in the Galois theory of differential fields for a homogeneous linear differential equation of the second order over the field $\mathbf C((X))$ is solved, and a classification of $SL(2)$-extensions and a description of the Picard–Vessiot extensions of this field are given. Bibliography: 5 titles. 
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     author = {N. V. Grigorenko},
     title = {Two problems in the {Galois} theory of differential fields for the field of formal power series},
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N. V. Grigorenko. Two problems in the Galois theory of differential fields for the field of formal power series. Sbornik. Mathematics, Tome 37 (1980) no. 3, pp. 327-335. http://geodesic.mathdoc.fr/item/SM_1980_37_3_a1/