%0 Journal Article %A Hans-Peter Seidel %T Classification of 4-Dimensional Generalized Symmetric Planes. %J Forum mathematicum %D 1991 %P 35-60 %V 3 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/FORUM_1991__3_2_186413/ %F FORUM_1991__3_2_186413