@article{SF_1980__19_134384,
     author = {B. Pondelicek},
     title = {The intersection graph on an ordered commutative semigroup.},
     journal = {Semigroup forum},
     pages = {213--218},
     publisher = {mathdoc},
     volume = {19},
     year = {1980},
     zbl = {0429.06003},
     url = {http://geodesic.mathdoc.fr/item/SF_1980__19_134384/}
}