@article{SF_1994__48_3_135321,
     author = {G. Thierrin and M. Ito and S.S. Yu},
     title = {Right k-dense languages.},
     journal = {Semigroup forum},
     pages = {313--326},
     publisher = {mathdoc},
     volume = {48},
     number = {3},
     year = {1994},
     url = {http://geodesic.mathdoc.fr/item/SF_1994__48_3_135321/}
}