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@article{FORUM_1991__3_2_186413, author = {Hans-Peter Seidel}, title = {Classification of {4-Dimensional} {Generalized} {Symmetric} {Planes.}}, journal = {Forum mathematicum}, pages = {35--60}, publisher = {mathdoc}, volume = {3}, number = {2}, year = {1991}, zbl = {0723.51004}, url = {http://geodesic.mathdoc.fr/item/FORUM_1991__3_2_186413/} }
Hans-Peter Seidel. Classification of 4-Dimensional Generalized Symmetric Planes.. Forum mathematicum, Tome 3 (1991) no. 2, pp. 35-60. http://geodesic.mathdoc.fr/item/FORUM_1991__3_2_186413/