Mohammed Qasim Al-Sammaraee and Khlaf Faris Al-Sammaraee, “Determination Micro Spectrohotometric of Pyridoxine Hydrochloride and Nicotinamide via Derivative Spectrophotometry First and Second”, Tikrit J. Pure Sci., vol. 22, no. 12, pp. 79–90, Feb. 2023.