@article{bwmeta1.element.desklight-3dee5385-5468-4419-9152-eb32d614a869,
author = {G. Gr\"atzer and J. P\l onka},
title = {A characterization of semilattices},
journal = {Colloquium Mathematicae},
volume = {22},
year = {1970},
pages = {21-24},
zbl = {0216.03401},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.desklight-3dee5385-5468-4419-9152-eb32d614a869}
}
G. Grätzer; J. Płonka. A characterization of semilattices. Colloquium Mathematicae, Tome 22 (1970) pp. 21-24. http://gdmltest.u-ga.fr/item/bwmeta1.element.desklight-3dee5385-5468-4419-9152-eb32d614a869/