@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/}
}