List of Articles Roozbeh Kalbasi Article 1 - Sulfonated polystyrene/montmorillonite nanocomposite as a new and efficient catalyst for the solvent-free Mannich reaction Ahmad Reza Massah Roozbeh Kalbasi Mitra Toghyani Iranian Journal of Catalysis , Issue 1 , Year , Winter 2012 Article 2 - BaO/TiO2-ZrO2 as a green and efficient basic catalyst for Knoevenagel condensation reaction 20.1001.1.22520236.2011.1.2.2.6 Roozbeh Kalbasi Zohreh Shahzeidi Farzad Zamani Iranian Journal of Catalysis , Issue 5 , Year , Spring 2011