Rasha Saad Saber Al Tikrity و Asmaa Ahmed Mohammed Al Rashidy 2023. Spectrophotometric determination of Folic acid (B9) by oxidative Coupling Reaction with 4-nitro-aniline. Tikrit Journal of Pure Science. 27, 6 (2023), 28–32. DOI:https://doi.org/10.25130/tjps.v27i6.755.