1. Growth of word length in DOL-systems;Doucet,1972
2. Introduction to Probabilistic Automata;Paz,1971
3. Formal series, finiteness properties and decision problems;Paz;Ann. Acad. Sci. Fenn., Ser. A I,1971
4. TOL-systems and languages;Rozenberg;Information and Control,1973
5. L-systems with interactions;Rozenberg;Journal of Computer and System Sciences,1973