Mohammed Qasim Al-Sammaraee, and Khlaf Faris Al-Sammaraee. “Determination Micro Spectrohotometric of Pyridoxine Hydrochloride and Nicotinamide via Derivative Spectrophotometry First and Second”. Tikrit Journal of Pure Science 22, no. 12 (February 3, 2023): 79–90. Accessed July 22, 2024. https://tjps.tu.edu.iq/index.php/tjps/article/view/934.