@article{SF_1974__9_134072,
     author = {A.Y.W. Lau},
     title = {Problems 44 and 39 on compact semilattices.},
     journal = {Semigroup forum},
     pages = {179--180},
     publisher = {mathdoc},
     volume = {9},
     year = {1974},
     zbl = {0285.22006},
     url = {http://geodesic.mathdoc.fr/item/SF_1974__9_134072/}
}