DABHI, H. et al. 2010. Formation Constants and Thermodynamic Parameters of Transition Metal Chelates Derived from Schiff Base of 4-Benzoyl- 1-(p-nitrophenyl)-3-methyl-2-pyrazolin-5-ones with Some Diamines. Asian Journal of Chemistry. 21, 9 (Jun. 2010), 6629–6635.