@article{GDZPPN00238809X, title = {Zur Axiomatik des Brandtschen Gruppoids.}, journal = {Mathematische Zeitschrift}, volume = {70}, year = {1958}, pages = {156-164}, zbl = {0084.25101}, url = {http://dml.mathdoc.fr/item/GDZPPN00238809X} }
Stolt, Bengt. Zur Axiomatik des Brandtschen Gruppoids.. Mathematische Zeitschrift, Tome 70 (1958) pp. 156-164. http://gdmltest.u-ga.fr/item/GDZPPN00238809X/