@article{SF_1986__34_134847,
     author = {K.D. jr. Magill},
     title = {On a family of ideals of {S(X).}},
     journal = {Semigroup forum},
     pages = {321--340},
     year = {1986},
     volume = {34},
     url = {http://geodesic.mathdoc.fr/item/SF_1986__34_134847/}
}