Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{PORMA_1974__33_2_115220, author = {Donnell, William}, title = {A note on entropic groupoids}, journal = {Portugaliae mathematica}, pages = {77--78}, publisher = {mathdoc}, volume = {33}, number = {2}, year = {1974}, mrnumber = {0333032}, zbl = {0287.20053}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1974__33_2_115220/} }
Donnell, William. A note on entropic groupoids. Portugaliae mathematica, Tome 33 (1974) no. 2, pp. 77-78. http://geodesic.mathdoc.fr/item/PORMA_1974__33_2_115220/