1. Carlyle, J. W., Greibach, S. A., and Paz, A.: A two-dimensional generating system modelling growth by binary cell division, Proc. 15th Conf. Switching and Automata Theory: 1–12 (1974).
2. Mayoh, B. H.: Multidimensional Lindenmayer organisms, Lect. Notes in Comp. Sci. 15; 302–326, Berlin: Springer-Verlag (1974).
3. Lindenmayer, A. and Rozenberg, G.: Parallel generation of maps. Developmental systems for cell layers, Lect. Notes in Comp. Sci. 73; 301–316, Berlin: Springer-Verlag (1979).
4. Nuryp, K. and Mayoh, B.: Map grammars: Cycles and the algebraic approach, Lect. Notes in Comp. Sci. 73: 331–340, Berlin: Springer-Verlag (1979).
5. Lück, H. B. and Lück, J.: Automata theoretical explanation of tissue growth. Proc. Int. Symp. on Math. Topics in Biol., ISMT, Res. Inst. Math., Kyoto: 174–185 (1978).