Spaces of linear differential equatios, and flag manifolds
Izvestiya. Mathematics , Tome 36 (1991) no. 1, pp. 183-197.

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B. Z. Shapiro. Spaces of linear differential equatios, and flag manifolds. Izvestiya. Mathematics , Tome 36 (1991) no. 1, pp. 183-197. http://geodesic.mathdoc.fr/item/IM2_1991_36_1_a9/

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