1. Solving a PSPACE-complete problem by P systems with restricted active membranes;Alhazov;Fund. Inform.,2003
2. M.R. Garey, D.J. Johnson, Computers and Intractability. A Guide to the Theory of NP-Completeness, W.H. Freeman, San Francisco, 1979.
3. Allocation of data bases and processors in a distributed computing system;Gavish;Manage. Distrib. Data Process.,1982
4. Gh. Păun, Computing with membranes, J. Comput. System Sci. 61(1) (2000) 108–143, and TUCS Research Report 208, 1998 (http://www.tucs.fi).
5. P systems with active membranes: attacking NP-complete problems;Păun;J. Automata, Lang. Combin.,2001