@article{01701489, title = {Perp-systems and partial geometries.}, journal = {Advances in Geometry}, volume = {2}, year = {2002}, pages = {1-12}, doi = {10.1515/advg.2001.025}, zbl = {0988.51006}, language = {en}, url = {http://dml.mathdoc.fr/item/01701489} }
De Clerck, Frank; Delanote, Mario; Hamilton, Nicholas; Mathon, Rudolf. Perp-systems and partial geometries.. Advances in Geometry, Tome 2 (2002) pp. 1-12. doi : 10.1515/advg.2001.025. http://gdmltest.u-ga.fr/item/01701489/