Khazdooz, Leila, Zarei, Amin, Hajipour, Abdol, Sheikhan, Nafisehsadat. A fast, simple and convenient procedure for the synthesis of fused pyrimidinone derivatives by using [Hmim][HSO4] as a green, efficient and reusable catalyst under solvent-free conditions. Iranian Journal of Catalysis. 2012;2(4):173-178.