Ruba Fahmi Abbas, et al. “Zero Order and First Derivative Spectrophotometric Determination of pb(II) by Complex With N,N’-Cyclohexane-l,2-Diylidene-Bis (4-Methaxybenzoythydrazide) (CHMBH)”. Journal of Wasit for Science and Medicine, vol. 11, no. 2, Aug. 2023, pp. 1-9, https://doi.org/10.31185/jwsm.458.