1. Alhazov, A., Martin-Vide, C., & Pan, L. (2003). Solving a PSPACE-complete problem by recognizing P systems with restricted active membranes. Fundamenta Informaticae, 58(2), 67–77.
2. Alhazov, A., Leporati, A., Mauri, G., Porreca, A. E., & Zandron, C. (2014). Space complexity equivalence of P systems with active membranes and Turing machines. Theoretical Computer Science, 529, 69–81.
3. Alhazov, A., Pan, L., & Păun, Gh. (2004). Trading polarizations for labels in P systems with active membranes. Acta Informatica, 41, 111–144.
4. Gazdag, Z., & Kolonits, G. (2019). A new method to simulate restricted variants of polarizationless P systems with active membranes. Journal of Membrane Computing, 1(4), 251–261. https://doi.org/10.1007/s41965-019-00024-z.
5. Gutiérrez-Naranjo, M. A., Pérez-Jiménez, M. J., Riscos-Núñez, A., & Romero-Campero, F. J. (2006). On the power of dissolution in P systems with active membranes, In: Freund, R., Păun, G., Rozenberg, Salomaa, A., (eds), 6th International Workshop on Membrane Computing, WMC 2005, LNCS 3850, Springer, 224–240.