Ahmad M, Mohammed AH, Ali Y, Al-Messri Z. Synthesis, Characterization and Evaluation of Some Pyranopyrazoles and Pyranopyrimidines Derivatives as Antioxidants for Lubricating Oils. Iraqi Journal of Science. 2023;55(1):1-11. Accessed June 6, 2026. https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/11919