R. Freund et al.:
"Maximal Variants of the Set Derivation Mode";
Talk: 17th International Conference on Membrane Computing (CMC17), Mailand; 2016-07-25 - 2016-07-29; in: "Proceedings of 17th International Conference on Membrane Computing (CMC17)", (2016), 57 - 72.
http://publik.tuwien.ac.at/files/publik_258073.pdf