@article{1103409003,
author = {Brown, Matthew R.},
title = {Semipartial geometries and generalized quadrangles of order {$(r,r\sp 2)$}},
journal = {Bull. Belg. Math. Soc. Simon Stevin},
volume = {5},
number = {5},
year = {1998},
pages = { 187-205},
language = {en},
url = {http://dml.mathdoc.fr/item/1103409003}
}
Brown, Matthew R. Semipartial geometries and generalized quadrangles of order {$(r,r\sp 2)$}. Bull. Belg. Math. Soc. Simon Stevin, Tome 5 (1998) no. 5, pp. 187-205. http://gdmltest.u-ga.fr/item/1103409003/