@article{2730, author = {Donnell, William}, title = {A note on entropic groupoids}, journal = {Portugaliae mathematica}, volume = {33}, year = {1974}, pages = {77-78}, zbl = {0287.20053}, mrnumber = {0333032}, language = {en}, url = {http://dml.mathdoc.fr/item/2730} }
Donnell, William. A note on entropic groupoids. Portugaliae mathematica, Tome 33 (1974) pp. 77-78. http://gdmltest.u-ga.fr/item/2730/