R. Freund, H. Fernau et al.:
"Array Insertion and Deletion P Systems";
Talk: Unconventional Computation & Natural Computation 2013, Mailand; 2013-05-01 - 2013-05-05; in: "12th International Conference, UCNC 2013, Milan, Italy, July 1-5, 2013. Proceedings", G. Mauri, A. Dennunzio et al. (ed.); Heidelberg (2013), ISBN: 978-3-642-39073-9; 67 - 78.