@article{GDZPPN001260944, title = {The one-block property in varieties of semigroups.}, journal = {Semigroup forum}, volume = {43}, year = {1991}, pages = {253-264}, zbl = {0722.20038}, url = {http://dml.mathdoc.fr/item/GDZPPN001260944} }
Agliano, P. The one-block property in varieties of semigroups.. Semigroup forum, Tome 43 (1991) pp. 253-264. http://gdmltest.u-ga.fr/item/GDZPPN001260944/