@article{SF_1978__16_134278,
     author = {J.A. Anderson and N. Kimura},
     title = {Tensor product of commutative unions of groups.},
     journal = {Semigroup forum},
     pages = {105--108},
     publisher = {mathdoc},
     volume = {16},
     year = {1978},
     zbl = {0387.20045},
     url = {http://geodesic.mathdoc.fr/item/SF_1978__16_134278/}
}