1. Some topological properties of information systems;Abd El Monsef;The Journal of Fuzzy Mathematics,2007
2. T. Beaubouef , F. Petry, Vagueness in spatial data: rough set and egg-yolk approaches, in: L. Monostori, J. Vncza, M. Ali (Eds.), Engineering of intelligent systems, proceedings of IEA/AIE 2001, Lecture Notes in Artificial Intelligence, vol. 2070, Springer-Verlag, Berlin, 2001, pp. 367–373.
3. On rough sets in topological Boolean algebra;Chuchro;RSKD,2001
4. Superstring, A Theory of Every thing;Davies,2000
5. Rules in incomplete information systems;Kryszkiewicz;Information Sciences,1999