1. Lecture Notes in Computer Science;A. Alhazov,2005
2. Cavaliere, M., Leupold, P.: Evolution and Observation–A Non-standard Way to Generate Formal Languages. Theoretical Computer Science 321(2-3), 233–248 (2004)
3. Lecture Notes in Computer Science;M. Cavaliere,2006
4. Cavaliere, M., Leupold, P.: Observation of String-Rewriting Systems. Fundamenta Informaticae 74(4), 447–462 (2006)
5. Ciobanu, G., Păun, G., Pérez-Jiménez, M.J.: Applications of Membrane Computing. Springer, Berlin (2006)