1. Log depth circuits for division and related problems;Beame;SIAM J. Comput.,1986
2. Transductions and Context-Free Languages;Berstel,1979
3. Rational Series and their Languages;Berstel,1988
4. The complexity of computing the number of strings of given length in context-free languages;Bertoni,1988
5. Counting functions and formal series in noncommuting variables;Bertoni;Inform. Process. Lett.,1990