%0 Journal Article %A M. H. Zakhar-Itkin %T The matrix Riccati differential equation and the semi-group of linear fractional transformations %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1973 %P 89-131 %V 28 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1973_28_3_a3/ %G en %F RM_1973_28_3_a3