1. Calude, C.S., Paun, G.:Computing with Cells and Atoms: After Five Years (new text added to Russian edition of the book with the same title first published by Taylor and Francis Publishers, London) (2001);
2. To be published by Pushchino Publishing House (2004)
3. Lecture Notes in Computer Science;E. Csuhaj-Varjú,2004
4. Dang, Z., Ibarra, O.H.: On P systems operating in sequential and limited parallel modes. In: Pre-Proc. 6th Workshop on Descriptional Complexity of Formal Systems (2004)
5. Lecture Notes in Computer Science;C. Li,2005