R. Kayesh, M. Z. Sultan, A. Rahman, M. G. Uddin, F. Aktar, and M. A. Rashid, “Development and Validation of a RP-HPLC Method for the Quantification of Omeprazole in Pharmaceutical Dosage Form”, J. Sci. Res., vol. 5, no. 2, pp. 335–342, Apr. 2013.