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@article{SF_1976__12_134175, author = {M. Putcha}, title = {The archimedean graph of a positive function on a semigroup.}, journal = {Semigroup forum}, pages = {221--232}, publisher = {mathdoc}, volume = {12}, year = {1976}, zbl = {0328.20056}, url = {http://geodesic.mathdoc.fr/item/SF_1976__12_134175/} }
M. Putcha. The archimedean graph of a positive function on a semigroup.. Semigroup forum, Tome 12 (1976), pp. 221-232. http://geodesic.mathdoc.fr/item/SF_1976__12_134175/