1. Ceterchi R., Mutyam M., Paun Gh., Subramanian K.G.: Array Rewriting P Systems, Natural Computing 2,229–249(2003).
2. Csuhaj-Varju E., Dassow J., Kelemen J., Paun Gh.: Grammar Systems: A grammatical approach to distribution and cooperation., Gordon and Breach Science Publishers, Topics in Computer Mathematics 5, Yverdon (1994).
3. Dassow J., Freund R., Paun Gh., Cooperating array grammar system, Int. J. of Pattern Recognition and, Artificial Intelligence 9, 1–25, (1995).
4. Fernau H., Freund R.: Bounded Parallelism in Array Grammars Used for Character Recognition, In: Perner P., Wang P., Rosenfeld A. (eds.), Advances in Structural and Syntactical Pattern Recognition (Proceedings of the SSPR’96), pp. 40–49. Springer, Berlin 1121(1996).
5. Kari L., Mateescu A., Paun GH. Salomaa A.: Teams in cooperating grammar systems, J. Exper. Th. AI, 7,347–359(1995).