R. Freund, M. Oswald:
"P systems with Conditional Communication Rules Assigned to Membranes";
Talk: Workshop on Membrane Computing, Tarragona; 2003-07-17 - 2003-07-22; in: "Preproceedings of the Workshop on Membrane Computing", (2003), 231 - 240.
http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04404617