Elbashir, A.A. and Abdallah alfaki, O. mohamed 2019. Utilization of 4-Chloro-7-Nittobenzo-2-Oxa-1, 3-Diazol (NBD-CL) as Chromogenic Reagent for Determination of Metformin hydrochloride (MET) in Pharmaceutical Formulation. Asian Journal of Pharmaceutical Research and Development. 7, 1 (Feb. 2019), 19–23. DOI:https://doi.org/10.22270/ajprd.v7i1.455.