Estimation of the Folic Acid Using Zero Order, Area Under Curve and First Derivative Spectrophotometric Methods in Pure and Marketed Tablet Formulations. ANJS [Internet]. 2017 Sep. 1 [cited 2024 Nov. 24];20(3):34-41. Available from: https://mail.anjs.edu.iq/index.php/anjs/article/view/101