R. Freund, A. Alhazov, S. Ivanov, S. Verlan:
"Tissue P Systems with Point Mutation Rules";
in: "Membrane Computing. 19th International Conference, CMC 2018", 11399; G. Rozenberg et al. (ed.); Springer International Publishing Switzerland, 2019, ISBN: 978-3-030-12796-1, 33 - 57.
https://publik.tuwien.ac.at/files/publik_285355.pdf