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@article{MM2_1996__89_3_156164, author = {Imre Z. Ruzsa}, title = {Logarithmic {Density} and {Measures} on {Semigroups.}}, journal = {Manuscripta mathematica}, pages = {307--318}, publisher = {mathdoc}, volume = {89}, number = {3}, year = {1996}, zbl = {0860.11005}, url = {http://geodesic.mathdoc.fr/item/MM2_1996__89_3_156164/} }
Imre Z. Ruzsa. Logarithmic Density and Measures on Semigroups.. Manuscripta mathematica, Tome 89 (1996) no. 3, pp. 307-318. http://geodesic.mathdoc.fr/item/MM2_1996__89_3_156164/