Geodesic
Cross ratio of a nondegenerate quadruple of subspaces
Funkcionalʹnyj analiz i ego priloženiâ, Tome 15 (1981) no. 1, pp. 76-77.

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É. F. Kaplenko; V. A. Ponomarev. Cross ratio of a nondegenerate quadruple of subspaces. Funkcionalʹnyj analiz i ego priloženiâ, Tome 15 (1981) no. 1, pp. 76-77. http://geodesic.mathdoc.fr/item/FAA_1981_15_1_a10/

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