@article {, title = {On String Languages Generated by Spiking Neural P systems }, journal = {Fourth Brainstorming Week on Membrane Computing }, volume = {I}, year = {2006}, month = {01/30/07-2/3/07}, pages = {169-193}, publisher = {F{\'e}nix Editora}, address = {Sevilla, Espa{\~n}a}, isbn = {84-611-0520-6}, author = {Haiming Chen and Rudolf Freund and Mihai Ionescu and Gheorghe Paun and Mario J. P{\'e}rez-Jim{\'e}nez} }