Norbert Blum. On the Power of Chain Rules in Context Free Grammars. In Mogens Nielsen, Erik Meineche Schmidt, editors, Automata, Languages and Programming, 9th Colloquium, Aarhus, Denmark, July 12-16, 1982, Proceedings. Volume 140 of Lecture Notes in Computer Science, pages 72-82, Springer, 1982.
Abstract is missing.