@article{SF_1996__53_2_135469,
     author = {J. Neggers and H.S. Kim},
     title = {Modular posets and semigroups.},
     journal = {Semigroup forum},
     pages = {57--62},
     publisher = {mathdoc},
     volume = {53},
     number = {2},
     year = {1996},
     zbl = {0848.06001},
     url = {http://geodesic.mathdoc.fr/item/SF_1996__53_2_135469/}
}