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@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}, publisher = {mathdoc}, volume = {24}, year = {1982}, zbl = {0503.06005}, url = {http://geodesic.mathdoc.fr/item/SF_1982__24_134538/} }
S.M. Goberstein. On the modularity of the lattice of fundamental orders on a semilattice.. Semigroup forum, Tome 24 (1982), pp. 83-86. http://geodesic.mathdoc.fr/item/SF_1982__24_134538/