@article{GDZPPN00125331X, title = {On the kernel of the wreath product of completely simple semigroups.}, journal = {Semigroup forum}, volume = {18}, year = {1979}, pages = {21-26}, zbl = {0415.20045}, url = {http://dml.mathdoc.fr/item/GDZPPN00125331X} }
Nakajima, S. On the kernel of the wreath product of completely simple semigroups.. Semigroup forum, Tome 18 (1979) pp. 21-26. http://gdmltest.u-ga.fr/item/GDZPPN00125331X/