@article{bwmeta1.element.desklight-ea5891d6-5c0d-4910-ba30-b24c1c69e685,
author = {J. Dudek},
title = {A characterization of some idempotent abelian groupoids},
journal = {Colloquium Mathematicae},
volume = {31},
year = {1974},
pages = {219-223},
zbl = {0298.20045},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.desklight-ea5891d6-5c0d-4910-ba30-b24c1c69e685}
}
J. Dudek. A characterization of some idempotent abelian groupoids. Colloquium Mathematicae, Tome 31 (1974) pp. 219-223. http://gdmltest.u-ga.fr/item/bwmeta1.element.desklight-ea5891d6-5c0d-4910-ba30-b24c1c69e685/