@article{SF_1972__5_133943,
     author = {K.H. Hofmann and A. Stralka},
     title = {Push-outs and strict projective limits of semilattices.},
     journal = {Semigroup forum},
     pages = {243--261},
     publisher = {mathdoc},
     volume = {5},
     year = {1972},
     zbl = {0385.06003},
     url = {http://geodesic.mathdoc.fr/item/SF_1972__5_133943/}
}