“Sensitive Spectrophotometric Determination of Tetracycline Hydrochloride Indosage Forms Using Sodium Nitroprusside and Hydroxylamine Hydrochloride”. Al-Nahrain Journal of Science, vol. 17, no. 3, June 2018, pp. 53-58, https://anjs.edu.iq/index.php/anjs/article/view/404.