Rasha Saad Saber Al Tikrity, and Asmaa Ahmed Mohammed Al Rashidy. “Spectrophotometric Determination of Folic Acid (B9) by Oxidative Coupling Reaction With 4-Nitro-Aniline”. Tikrit Journal of Pure Science 27, no. 6 (January 29, 2023): 28–32. Accessed June 17, 2025. https://tjpsj.org/index.php/tjps/article/view/755.