Fadavipoor, Elham, Badri, Rashid. Imidazolium Hydrogen Sulphate Supported on Copper Oxide Nanoparticles as an efficient simple Heterogeneous Acidic Catalyst for Multi-component Synthesis of 1, 4- dihydro Pyrano [2, 3-c] pyrazoles Derivatives. Iranian Journal of Catalysis. 2021;11(2):165-174. doi: