@article{SF_1994__48_3_135318,
     author = {C.H. Park},
     title = {On right congruences associated with the input semigroup {S} of automata.},
     journal = {Semigroup forum},
     pages = {263--272},
     publisher = {mathdoc},
     volume = {48},
     number = {3},
     year = {1994},
     zbl = {0830.20089},
     url = {http://geodesic.mathdoc.fr/item/SF_1994__48_3_135318/}
}