@article{10_4153_CMB_1965_039_9,
     author = {Potts, D. H.},
     title = {Axioms for {Semi-Lattices}},
     journal = {Canadian mathematical bulletin},
     pages = {519--519},
     year = {1965},
     volume = {8},
     number = {4},
     doi = {10.4153/CMB-1965-039-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1965-039-9/}
}