@article{GDZPPN002024500, title = {Nets Associated to Multigroupoids.}, journal = {Aequationes mathematicae}, volume = {5}, year = {1970}, pages = {10-18}, zbl = {0221.20100}, url = {http://dml.mathdoc.fr/item/GDZPPN002024500} }
Havel, Václav. Nets Associated to Multigroupoids.. Aequationes mathematicae, Tome 5 (1970) pp. 10-18. http://gdmltest.u-ga.fr/item/GDZPPN002024500/