@article{2614, author = {Fantham, P.H.H.}, title = {On invariant multiplications in a category}, journal = {Portugaliae mathematica}, volume = {29}, year = {1970}, pages = {13-26}, zbl = {0218.18005}, mrnumber = {0294434}, language = {en}, url = {http://dml.mathdoc.fr/item/2614} }
Fantham, P.H.H. On invariant multiplications in a category. Portugaliae mathematica, Tome 29 (1970) pp. 13-26. http://gdmltest.u-ga.fr/item/2614/