Md Rafique Ullah and Mohammad Mahbubul Hasan, “A Rapid Spectrophotometric Method for the Determination of Trace Amount of Zinc (II) Ion in Aqueous Medium using Alizarin Red S as a Chelating Agent”, J. Int. Acad. Phys. Sci., vol. 15, no. 6, pp. 477–486, Oct. 2011.