@article{GDZPPN002432560, title = {Involutory Collineations of Finite Planes.}, journal = {Mathematische Zeitschrift}, volume = {192}, year = {1986}, pages = {235-240}, zbl = {0599.51010}, url = {http://dml.mathdoc.fr/item/GDZPPN002432560} }
Ho, C.Y. Involutory Collineations of Finite Planes.. Mathematische Zeitschrift, Tome 192 (1986) pp. 235-240. http://gdmltest.u-ga.fr/item/GDZPPN002432560/