@article{00436730, title = {Thickness in topological transformation semigroups.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {16}, year = {1993}, pages = {493-502}, doi = {10.1155/S0161171293000602}, zbl = {0788.43001}, language = {en}, url = {http://dml.mathdoc.fr/item/00436730} }
Haynes, Tyler. Thickness in topological transformation semigroups.. International Journal of Mathematics and Mathematical Sciences, Tome 16 (1993) pp. 493-502. doi : 10.1155/S0161171293000602. http://gdmltest.u-ga.fr/item/00436730/