@article{2528,
author = {Hill, Paul},
title = {Concerning anti-closed subsets in semigroups},
journal = {Portugaliae mathematica},
volume = {26},
year = {1967},
pages = {193-200},
zbl = {0183.02203},
mrnumber = {0248264},
language = {en},
url = {http://dml.mathdoc.fr/item/2528}
}
Hill, Paul. Concerning anti-closed subsets in semigroups. Portugaliae mathematica, Tome 26 (1967) pp. 193-200. http://gdmltest.u-ga.fr/item/2528/