1. J. Berstel and M. Nielsen. The growth range equivalence problem for D0L systems is decidable. In A. Lindenmayer and G. Rozenberg, editors, Automata, Languages, Development, pages 161–178. North-Holland, Amsterdam, 1976.
2. A. Ehrenfeucht and G. Rozenberg. The equality of E0L languages and codings of 0L languages. International Journal of Computer Mathematics, 4:95–104, 1974.
3. Z. Ésik and W. Kuich. A Kleene theorem for Lindenmayerian algebraic power series. Journal of Automata, Languages and Combinatorics, 5:109–122, 2000.
4. J. Honkala. On Lindenmayerian series in complete semirings. In G. Rozenberg and A. Salomaa, editors, Developments in Language Theory, pages 179–192. World Scientific, Singapore, 1994.
5. J. Honkala. An iteration property of Lindenmayerian power series. In J. Karhumäki, H. Maurer, and G. Rozenberg, editors, Results and Trends in Theoretical Computer Science, pages 159–168. Springer, Berlin, 1994.