TY  - BOOK
AU  - Buchi Richard J
AU  - Siefkes Dirk
TI  - Finite automata, their algebras and grammars: towards a theory of formal expressions
U1  - 511.3 
PY  - 1989///
CY  - New York
PB  - Springer-Verlag
KW  - Algebra
KW  - Finite algebra
ER  -