@article{SF_1974__6_133955,
     author = {F.R. McMorris and C.S. jr. Johnson},
     title = {Weakly self-injective semilattices.},
     journal = {Semigroup forum},
     pages = {3--11},
     year = {1974},
     volume = {6},
     zbl = {0256.06003},
     url = {http://geodesic.mathdoc.fr/item/SF_1974__6_133955/}
}