1. Comparison between different kinds of approximations by using a family of binary relations;Abu-Donia;Knowl. Based Syst.,2008
2. β-approximation spaces;Abu-Donia;J. Hybrid Comput. Res.,2008
3. Finite information systems;Abu-Donia;Appl. Math. Inform. Sci.,2007
4. β-open sets and β-continuous mappings;Abd El-Monsef;Bull. Fac. Assiut Uni.,1983
5. Semi-preopen sets;Andrijevic;Mat. Vesnik,1986