publication venue for Pancyclicity in switching classes 2000 ON THE SUBWORD COMPLEXITY OF LOCALLY CATENATIVE DOL LANGUAGES 1983 ON THE SUBWORD COMPLEXITY OF M-FREE D0L LANGUAGES 1983 ON THE SUBWORD COMPLEXITY OF DOL LANGUAGES WITH A CONSTANT DISTRIBUTION 1981 ON THE EMPTINESS OF THE INTERSECTION OF 2 DOS LANGUAGES PROBLEM 1980 FINDING A HOMOMORPHISM BETWEEN 2 WORDS IS NP-COMPLETE 1979 OBSERVATION ON SCATTERED GRAMMARS 1979