- Apostolos Syropoulos. Mathematics of multisets. In Cristian S. Calude, Gheorghe Pun, Grzegorz Rozenberg, and Arto Salomaa, editors, Multiset Processing: Mathematical, Computer Science, and Molecular Computing Points of View, volume 2235 of Lecture Notes in Computer Science, pages 343-358. Springer-Verlag, Berlin, Germany, 2001.
- Apostolos Syropoulos. Categorical Models of Multisets. To appear in the Romanian Journal of Information Science and Technology
- A. Syropoulos, E.G. Mamatas, P.C. Allilomes, and K.T. Sotiriades. A distributed simulation of P systems, in Preproceedings of the Workshop on Membrane Computing, Artiom Alhazov, Carlos Martin-Vide and Gheorghe Paun (Editors), Tarragona, Spain, July 17-22 2003. (An updated version has appeared in Volume 2933/2004 of Spinger's Lecture Notes in Computer Science.)
- Apostolos Syropoulos. Fuzzifying P Systems, submitted for publication.
- A. Syropoulos, P.C. Allilomes, S. Doumanis, E.G. Mamatas and K.T. Sotiriades. Computing with P Systems. Work in progress.
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