1. Lecture Notes in Computer Science;A. Alhazov,2006
2. Alhazov, A., Freund, R., Rogozhin, Y.: Some Optimal Results on Communicative P Systems with Minimal Cooperation. In: Gutiérrez-Naranjo, M.A., Păun, G., Pérez-Jiménez, M.J. (eds.) Cellular Computing (Complexity Aspects), ESF PESC Exploratory Workshop, Fénix Editora, Sevilla, pp. 23–36 (2005)
3. Lecture Notes in Computer Science;A. Alhazov,2005
4. Alhazov, A., Rogozhin, Y.: Minimal Cooperation in Symport/Antiport P Systems with One Membrane. In: Gutiérrez-Naranjo, M.A., Riscos-Núñez, A., Romero-Campero, F.J., Sburlan, D. (eds.) Third Brainstorming Week on Membrane Computing, RGNC TR 01/2005, University of Seville, Fénix Editora, Sevilla, pp. 29–34 (2005)
5. Lecture Notes in Computer Science;A. Alhazov,2006