Sunil, A., and S. J. . Rao. “Transition Metal-Oxo Based Sensing of Chromium (III) Using 1, 2-Hydroxyphenylthiourea in Activator and Surfactant Medium”. International Journal of Chemistry and Materials Research, vol. 2, no. 10, Oct. 2014, pp. 126-34, https://archive.conscientiabeam.com/index.php/64/article/view/1838.