@article{GDZPPN001248308,
title = {Clan acts and codimension.},
journal = {Semigroup forum},
volume = {4},
year = {1972},
pages = {206-214},
zbl = {0255.54032},
url = {http://dml.mathdoc.fr/item/GDZPPN001248308}
}
Hofmann, K.H.; Day, J.M. Clan acts and codimension.. Semigroup forum, Tome 4 (1972) pp. 206-214. http://gdmltest.u-ga.fr/item/GDZPPN001248308/