1. Lect Notes Comput Sci;N.G. David,1993
2. J. Dassow and V. Mitrana, Self Cross-over Systems, In ‘Discrete Mathematics and Theoretical Computer Science’, Springer Series, G. Paun (Ed.), 1998, 283–294.
3. R. Freund, Splicing Systems on Graphs, Proc. Intelligence in Neural and Biological Systems, IEEE Press, 1995, 189–194.
4. Lect Notes Comput Sci;A. Habel,1992
5. T. Head, Formal Language Theory and DNA: An analysis of the generative capacity of recombinant behaviours, Bulletin of Mathematical Biology, 49, 1987, 735–759.