@article{SF_1970__1_133792,
     author = {J.D. Lawson and W. Williams},
     title = {Topological semi-lattices and their underlying spaces.},
     journal = {Semigroup forum},
     pages = {209--223},
     publisher = {mathdoc},
     volume = {1},
     year = {1970},
     zbl = {0211.02901},
     url = {http://geodesic.mathdoc.fr/item/SF_1970__1_133792/}
}