@article{bwmeta1.element.desklight-67004ab1-f37a-4877-929f-f7ca7c776ed5,
author = {B. M. Schein},
title = {Function $\cup$-semigroups},
journal = {Colloquium Mathematicae},
volume = {31},
year = {1974},
pages = {11-20},
zbl = {0291.20084},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.desklight-67004ab1-f37a-4877-929f-f7ca7c776ed5}
}
B. M. Schein. Function ∪-semigroups. Colloquium Mathematicae, Tome 31 (1974) pp. 11-20. http://gdmltest.u-ga.fr/item/bwmeta1.element.desklight-67004ab1-f37a-4877-929f-f7ca7c776ed5/