1. R. Baker and G. T. Herman, ?Simulation of organisms using a developmental model, Parts I and II,?Int. J. Bio-Med. Comp., to appear.
2. E. F. Codd,Cellular Automata (Academic Press, New York, 1968).
3. D. van Dalen, ?A note on some systems of Lindenmayer,?Math. Systems Theory 5:128?140 (1971).
4. P. Doucet, ?On the membership question in some Lindenmayer systems,?Indag. Math. 34:45?52 (1972).
5. H. Feliciangeli and G. T. Herman, ?Algorithms for producing grammars from sample derivations,?J. Comp. Syst. Sci., to appear.