@article{GDZPPN001253441, title = {The Structure of ...-unipotent semigroups.}, journal = {Semigroup forum}, volume = {18}, year = {1979}, pages = {189-200}, zbl = {0426.20055}, url = {http://dml.mathdoc.fr/item/GDZPPN001253441} }
Edwards, C.C. The Structure of ...-unipotent semigroups.. Semigroup forum, Tome 18 (1979) pp. 189-200. http://gdmltest.u-ga.fr/item/GDZPPN001253441/