1. Alberts, B., Raff, M.: Essential Cell Biology. An Introduction to the Molecular Biology of the Cell. Garland Science, New York (1997)
2. Bernardini, F., Gheorghe, M.: Cell communication in tissue P systems: universality results. Soft Computing 9(9), 640–649 (2005)
3. Lecture Notes in Computer Science;F. Bernardini,2003
4. Lecture Notes in Computer Science;D. Besozzi,2005
5. Bianco, L.: Membrane Models of Biological Systems, PhD Thesis, University of Verona (in preparation)