K. Nahar, J. J. Joti, M. A. Ullah, A. Hasan, M. A. K. Azad, and A. Hasnat, “A Simple RP-HPLC Method for the Determination of Omeprazole in Human Serum and Urine: Validation and Application in Pharmacokinetic Study”, Dhaka Univ. J. Pharm. Sci, vol. 8, no. 2, pp. 123–130, Sep. 2010.