1. Binder, A., Freund, R., Oswald, M., Vock, L.: Extended spiking neural P systems with excitatory and inhibitory astrocytes. In: Proceedings of the 8th Conference on 8th WSEAS International Conference on Evolutionary Computing, EC 2007, vol. 8, pp. 320–325. World Scientific and Engineering Academy and Society (WSEAS), Stevens Point, Wisconsin, USA (2007)
2. Chen, H., Freund, R., Ionescu, M., Paun, G., Pérez-Jiménez, M.J.: On string languages generated by spiking neural P systems. Fundam. Inform. 75(1–4), 141–162 (2007)
3. Chen, H., Ionescu, M., Ishdorj, T.O., Paun, A., Paun, G., Pérez-Jiménez, M.J.: Spiking neural P systems with extended rules: universality and languages. Nat. Comput. 7(2), 147–166 (2008)
4. García-Quismondo, M., Gutiérrez-Escudero, R., del Amor, M.A.M., Orejuela-Pinedo, E.F., Pérez-Hurtado, I.: P-lingua 2.0: a software framework for cell-like P systems. Int. J. Comput. Commun. Control 4, 234–243 (2009)
5. Ionescu, M., Paun, G., Yokomori, T.: Spiking neural P systems. Fundam. Inf. 71, 279–308 (2006)