B. YILMAZ, and M. CAVUS. “Development and Validation of Gas Chromatography-Mass Spectrometry Method for Determination of Metoprolol in Rabbit Plasma”. International Journal of Pharma and Bio Sciences, vol. 1, no. 1, Mar. 2010, pp. 1-13, https://ijpbs.net/index.php/journal/article/view/130.