Mezaal, E. N.; Sadiq, K. A.; Zaki, A. N.; Rumez, R. M. Spectrophotometric Determination of Cu(II) by Complex With Ethyl Cyano(2-Methyl Carboxylate Phenyl Azo Acetate) (ECA). IHJPAS 2017, 30 (1), 96-106. https://doi.org/10.30526/30.1.1063.