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@article{PORMA_1970__29_1_115104, author = {Fantham, P.H.H.}, title = {On invariant multiplications in a category}, journal = {Portugaliae mathematica}, pages = {13--26}, publisher = {mathdoc}, volume = {29}, number = {1}, year = {1970}, mrnumber = {0294434}, zbl = {0218.18005}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1970__29_1_115104/} }
Fantham, P.H.H. On invariant multiplications in a category. Portugaliae mathematica, Tome 29 (1970) no. 1, pp. 13-26. http://geodesic.mathdoc.fr/item/PORMA_1970__29_1_115104/