@article{GDZPPN001250302, title = {A subdirectly irreducible band accepting a = a.}, journal = {Semigroup forum}, volume = {7}, year = {1974}, pages = {271-274}, zbl = {0292.20060}, url = {http://dml.mathdoc.fr/item/GDZPPN001250302} }
Fennemore, C.F. A subdirectly irreducible band accepting a = a.. Semigroup forum, Tome 7 (1974) pp. 271-274. http://gdmltest.u-ga.fr/item/GDZPPN001250302/