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@article{SF_1971__3_133869, author = {A.H. Clifford}, title = {The structure of orthodox unions of groups.}, journal = {Semigroup forum}, pages = {283--337}, publisher = {mathdoc}, volume = {3}, year = {1971}, zbl = {0241.20048}, url = {http://geodesic.mathdoc.fr/item/SF_1971__3_133869/} }
A.H. Clifford. The structure of orthodox unions of groups.. Semigroup forum, Tome 3 (1971), pp. 283-337. http://geodesic.mathdoc.fr/item/SF_1971__3_133869/