@article{GDZPPN002426587, title = {On Groupoids Having a Linear Congruence Class Geometry.}, journal = {Mathematische Zeitschrift}, volume = {180}, year = {1982}, pages = {395-412}, zbl = {0471.51003}, url = {http://dml.mathdoc.fr/item/GDZPPN002426587} }
Ihringer, Thomas. On Groupoids Having a Linear Congruence Class Geometry.. Mathematische Zeitschrift, Tome 180 (1982) pp. 395-412. http://gdmltest.u-ga.fr/item/GDZPPN002426587/