R. Freund, A. Alhazov, S. Ivanov:
"P Systems with Randomized Right-hand Sides of Rules";
in: "Proceedings of BWMC 2017: 15th Brainstorming Week on Membrane Computing (2017), Sevilla", Gh. Paun et al. (ed.); Fénix Editora, 2017, ISBN: 978-84-946316-9-6, 13 - 42.