Nouria A. Belkher , Aisha A. Al-abbas and Mohamed Zidan. “Potentiometric Studies on Stability Constant of the Complexes of Some Essential Transition Metal Ions With L-Valine”. Journal of Pure & Applied Sciences 18, no. 3 (May 1, 2019). Accessed May 3, 2024. https://sebhau.edu.ly/journal/jopas/article/view/240.