1. Alhazov, A., Martin-Vide, C., Pan, L.: Solving a PSPACE-complete problem by recognizing P systems with restricted active membranes. Fundamenta Informaticae 58, 67–77 (2003)
2. Arroyo, F., Baranda, A., Castellanos, J., Păun, G.: Membrane Computing: The power of (rule) creation. Journal of Universal Computer Science 8, 369–381 (2002)
3. Bernardini, F., Gheorghe, M.: Population P Systems. Journal of Universal Computer Science 10, 509–539 (2004)
4. Besozzi, D., Cazzaniga, P., Pescini, D., Mauri, G., Colombo, S., Martegani, E.: Modeling and stochastic simulation of the Ras/cAMP/PKA pathway in the yeast sacharomyces cerevisiae evidences a key regulatory function for intracellular guanine nucleotides pools. Journal of BioTechnology 133, 377–385 (2008)
5. Borodin, A.: On relating time and space to size and depth. SIAM Journal of Computing 6(4), 733–744 (1977)