%0 Journal Article %A V. V. Balashchenko %A Yu. D. Churbanov %T Invariant structures on homogeneous $\Phi$-spaces of order~5 %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1990 %P 195-197 %V 45 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1990_45_1_a5/ %G en %F RM_1990_45_1_a5