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@article{SF_1995__51_1_135407, author = {R. Padmanabhan and H. Lakser and B. Wolk}, title = {Varieties of operator semigroups representing partitions.}, journal = {Semigroup forum}, pages = {135--152}, publisher = {mathdoc}, volume = {51}, number = {1}, year = {1995}, zbl = {0835.20079}, url = {http://geodesic.mathdoc.fr/item/SF_1995__51_1_135407/} }
R. Padmanabhan; H. Lakser; B. Wolk. Varieties of operator semigroups representing partitions.. Semigroup forum, Tome 51 (1995) no. 1, pp. 135-152. http://geodesic.mathdoc.fr/item/SF_1995__51_1_135407/