Noubarani, Maryam, et al. “Improved HPLC Method for Determination of Four PPIs, Omeprazole, Pantoprazole, Lansoprazole and Rabeprazole in Human Plasma”. Journal of Pharmacy & Pharmaceutical Sciences, vol. 13, no. 1, Jan. 2010, pp. 1-10, doi:10.18433/J3GP4Q.