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@article{MS2_1994__75_2_167302, author = {J.H.E. Cohn}, title = {On {n-Sum} {Groups.}}, journal = {Mathematica Scandinavica}, pages = {44--58}, publisher = {mathdoc}, volume = {75}, number = {2}, year = {1994}, zbl = {0833.20028}, url = {http://geodesic.mathdoc.fr/item/MS2_1994__75_2_167302/} }
J.H.E. Cohn. On n-Sum Groups.. Mathematica Scandinavica, Tome 75 (1994) no. 2, pp. 44-58. http://geodesic.mathdoc.fr/item/MS2_1994__75_2_167302/