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@article{AM2_1968__1_135975, author = {Kermit Sigman}, title = {Medial {Topological} {Groupoids.}}, journal = {Aequationes mathematicae}, pages = {217--234}, publisher = {mathdoc}, volume = {1}, year = {1968}, zbl = {0164.33604}, url = {http://geodesic.mathdoc.fr/item/AM2_1968__1_135975/} }
Kermit Sigman. Medial Topological Groupoids.. Aequationes mathematicae, Tome 1 (1968), pp. 217-234. http://geodesic.mathdoc.fr/item/AM2_1968__1_135975/