TY - JOUR AU - Rupert, C.P. TI - On commutative Kleene monoids. JO - Semigroup forum PY - 1991 VL - 43 IS - 2 SP - 163 EP - 177 KW - recognizable set; rational set; rational monoid; rational morphism; commutative monoid; Kleene monoids UR - http://eudml.org/doc/135106 ER -