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@article{10_4064_cm_22_1_21_24, author = {G. Gr\"atzer and J. P{\l}onka}, title = {A characterization of semilattices}, journal = {Colloquium Mathematicum}, pages = {21--24}, publisher = {mathdoc}, volume = {22}, number = {1}, year = {1970}, doi = {10.4064/cm-22-1-21-24}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-22-1-21-24/} }
G. Grätzer; J. Płonka. A characterization of semilattices. Colloquium Mathematicum, Tome 22 (1970) no. 1, pp. 21-24. doi : 10.4064/cm-22-1-21-24. http://geodesic.mathdoc.fr/articles/10.4064/cm-22-1-21-24/
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