Gouda, Moustafa Ahmed, et al. “One-Pot Pseudo Five-Component Synthesis and Antioxidant Evaluation of 4,4’-(aryl-methylene)bis(3-Methyl-1-Phenyl-1H-Pyrazol-5-Ol)”. European Journal of Chemistry, vol. 7, no. 3, Sept. 2016, pp. 363-7, doi:10.5155/eurjchem.7.3.363-367.1474.