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@article{FAA_1981_15_1_a10, author = {\'E. F. Kaplenko and V. A. Ponomarev}, title = {Cross ratio of a nondegenerate quadruple of subspaces}, journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a}, pages = {76--77}, publisher = {mathdoc}, volume = {15}, number = {1}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/FAA_1981_15_1_a10/} }
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/