On finite automata with a time-variant structure. On the index of a context-free grammar and language. References and Citations. Probabilistic and weighted grammars. The generative capacity of transformational grammars of Ginsburg and Partee.
Matrix grammars with a leftmost restriction.
Azaria Paz and Arto Salomaa. Integral sequential word functions and growth equivalence of Lindenmayer systems. H. A. Maurer, A. Salomaa, and D. Wood. Uniform interpretations of L forms. H. A. Maurer, A. Salomaa, and D. Wood.