Geodesic
On the theory of the matrix Riccati equation. II
Sbornik. Mathematics, Tome 77 (1994) no. 1, pp. 213-230 Cet article a éte moissonné depuis la source Math-Net.Ru

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This paper is a continuation of the author's previous paper [1] with the same title, which contains an investigation of properties of the matrix Riccati equation with variable coefficients that arises from variational problems. For the investigation the matrix cross-ratio was introduced – an invariant of a quadruple of points in the Grassmann manifold of $n$-dimensional subspaces in a $2n$-dimensional linear space with respect to the action of the unimodular group of generalized linear fractional transformations on the Grassmann manifold. The properties of the matrix cross-ratio are investigated in the present article; classes of complex Riccati equations giving rise to flows on homogeneous Siegel domains of types I, II, and III are distinguished; a matrix analogue of the Schwarzian derivative is introduced. 
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M. I. Zelikin. On the theory of the matrix Riccati equation. II. Sbornik. Mathematics, Tome 77 (1994) no. 1, pp. 213-230. http://geodesic.mathdoc.fr/item/SM_1994_77_1_a12/

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