R. More, Abhijit, et al. “Determination of Ramipril and Its Active Metabolite Ramiprilat from Plasma by Liquid Chromatography-Mass Spectrometry for Bioequivalence Studies”. Asian Journal of Chemistry, vol. 18, no. 4, Mar. 2010, pp. 2547-51, https://asianpubs.org/index.php/ajchem/article/view/20617.