Hatamjafari, Farhad. 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. 2015;9(1):95-101. doi: