@article{SF_1982__24_134538,
     author = {S.M. Goberstein},
     title = {On the modularity of the lattice of fundamental orders on a semilattice.},
     journal = {Semigroup forum},
     pages = {83--86},
     year = {1982},
     volume = {24},
     zbl = {0503.06005},
     url = {http://geodesic.mathdoc.fr/item/SF_1982__24_134538/}
}