@article{SF_1978__16_134285,
     author = {J.A. Anderson},
     title = {Tensor product of commutative semigroups.},
     journal = {Semigroup forum},
     pages = {153--164},
     year = {1978},
     volume = {16},
     zbl = {0387.20046},
     url = {http://geodesic.mathdoc.fr/item/SF_1978__16_134285/}
}