R. Freund, A. Alhazov, S. Ivanov:
"P Systems and the Concept of Fairness";
in: "Conference on Mathematical Foundations of Informatics, 2017, Chişinău: Proceedings MFOI, 2017", Acad. of Sciences of Moldova, 2017, 978‐9975‐4237‐6‐2, 11 - 26.
https://publik.tuwien.ac.at/files/publik_265299.pdf