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@article{CMH_1934__6_138612, author = {Arnold Emch}, title = {Ueber symmetrische {Monoide} und {Kegel.}}, journal = {Commentarii mathematici Helvetici}, pages = {133--143}, publisher = {mathdoc}, volume = {6}, year = {1934}, zbl = {0007.32305}, url = {http://geodesic.mathdoc.fr/item/CMH_1934__6_138612/} }
Arnold Emch. Ueber symmetrische Monoide und Kegel.. Commentarii mathematici Helvetici, Tome 6 (1934), pp. 133-143. http://geodesic.mathdoc.fr/item/CMH_1934__6_138612/