@article{GDZPPN001258893, title = {Regular involution groupoids revisited.}, journal = {Semigroup forum}, volume = {33}, year = {1986}, pages = {353-368}, zbl = {0624.20038}, url = {http://dml.mathdoc.fr/item/GDZPPN001258893} }
Krishnan, V.S.; Levitan, M. Regular involution groupoids revisited.. Semigroup forum, Tome 33 (1986) pp. 353-368. http://gdmltest.u-ga.fr/item/GDZPPN001258893/