@article{GDZPPN001256149, title = {Left thickness, left amenability and extreme left amenability.}, journal = {Semigroup forum}, volume = {26}, year = {1983}, pages = {307-316}, zbl = {0509.22001}, url = {http://dml.mathdoc.fr/item/GDZPPN001256149} }
Wong, J.C.S. Left thickness, left amenability and extreme left amenability.. Semigroup forum, Tome 26 (1983) pp. 307-316. http://gdmltest.u-ga.fr/item/GDZPPN001256149/