K. Basavaiah, V. Ramakrishna, U. R. Anilkumar, and B. C. Somashekar, “Spectrophotometric determination of lansoprazole in pharmaceuticals using bromate-bromide mixture based on redox and complexation reactions”, Eclet. Quim., vol. 32, no. 1, pp. 57–64, Apr. 2007.