R. Freund, A. Alhazov:
"Polarizationless P Systems with One Active Membrane";
Talk: BWMC 2015, Sevilla; 2015-02-02 - 2015-02-06; in: "Proceedings of the Thirteenth Brainstorming Week on Membrane Computing", Gh. Paun et al. (ed.); Fenix Editora, (2015), 9 - 18.