@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/