@article{SF_1976__12_134169,
     author = {J. W. Lea},
     title = {Separating points by prime filters in modular semilattices.},
     journal = {Semigroup forum},
     pages = {180--182},
     year = {1976},
     volume = {12},
     zbl = {0332.06008},
     url = {http://geodesic.mathdoc.fr/item/SF_1976__12_134169/}
}