@article{1103051777, author = {Kelly, P. J. and Paige, L. J.}, title = {Symmetric perpendicularity in Hilbert geometries.}, journal = {Pacific J. Math.}, volume = {2}, number = {4}, year = {1952}, pages = { 319-322}, language = {en}, url = {http://dml.mathdoc.fr/item/1103051777} }
Kelly, P. J.; Paige, L. J. Symmetric perpendicularity in Hilbert geometries.. Pacific J. Math., Tome 2 (1952) no. 4, pp. 319-322. http://gdmltest.u-ga.fr/item/1103051777/