Hatamjafari, Farhad (2015). SiO2-BaCl2 as a Highly Efficient and Reusable Heterogeneous Catalyst for the One-pot Synthesis of 3,4-dihydropyrimidin-2-(1H)- one/thione Derivatives Under Solvent-free Conditions. *Journal of Applied Chemical Research*, 9(1), 95-101.