[1] HERMAN G. T., VITANYI P. M. B.: Growth functions associated with biological development. Amer. Math. Monthly, 1976, 1-15. MR 0395900 | Zbl 0343.92002

[2] HROMKOVlČ J., KELEMENOVÁ A.: On kinetic models of cell population. Proc. of Simulation of Systems in Biology and Medicine '82, Prague, 1982, Microfishe No. 735.

[3] KELEMENOVÁ A.: Levels in L-systems. Mathematica Slovaca, 33, 1983, 87-97. MR 0689284 | Zbl 0539.68044

[4] LINDENMAYER A., ROZENBERG G.: Automata, Languages, Development. North Holland, Amsterdam, 1976. MR 0451874 | Zbl 0346.92001

[5] ROZENBERG G., SALOMAA A.: The Mathematical Theory of L-systems. Academic Press, New York, 1980. MR 0561711 | Zbl 0508.68031

[6] SZILARD A.: Growth functions of Lindenmayer systems. Univ. of Western Ontario Computer Science Department Technical Report No. 4, London, Canada, 1971.

[7] VITANYI P. M. B.: Lindenmayer Systems: Structure, Languages and Growth functions. Mathematisch Centrum, Amsterdam, 1978. MR 0596583