@article{GDZPPN001264311,
title = {Varieties of operator semigroups representing partitions.},
journal = {Semigroup forum},
volume = {51},
year = {1995},
pages = {135-152},
zbl = {0835.20079},
url = {http://dml.mathdoc.fr/item/GDZPPN001264311}
}
Padmanabhan, R.; Lakser, H.; Wolk, B. Varieties of operator semigroups representing partitions.. Semigroup forum, Tome 51 (1995) pp. 135-152. http://gdmltest.u-ga.fr/item/GDZPPN001264311/