S. Al-Kalissy R, K. Mohammed A. Spectrophotometric Method for the Determination of Tetracycline and Doxycycline by Oxidizing Coupling Reaction with 4-aminoantipyrine. IHJPAS. 2017;28(3):154-168. Accessed May 1, 2025. https://www.jih.uobaghdad.edu.iq/index.php/j/article/view/150