Rudolf Freund, Lila Kari, Marion Oswald, Petr Sosík. Computationally universal P systems without priorities: two catalysts are sufficient. Theoretical Computer Science, 330(2):251-266, 2005. [doi]
@article{FreundKOS05, title = {Computationally universal P systems without priorities: two catalysts are sufficient}, author = {Rudolf Freund and Lila Kari and Marion Oswald and Petr Sosík}, year = {2005}, doi = {10.1016/j.tcs.2004.06.029}, url = {http://dx.doi.org/10.1016/j.tcs.2004.06.029}, researchr = {https://researchr.org/publication/FreundKOS05}, cites = {0}, citedby = {0}, journal = {Theoretical Computer Science}, volume = {330}, number = {2}, pages = {251-266}, }