K. S. Kokilambigai, K. S. Lakshmi, A. Kumar, G. Chandrayan, K. Satyam, and M. K. Singh, “SPECTROPHOTOMETRIC ESTIMATION OF CILNIDIPINE IN BULK AND PHARMACEUTICAL DOSAGE FORM USING N-(1-NAPHTHYL) ETHYLENE DIAMINE DIHYDROCHLORIDE”, Int J Pharm Pharm Sci, vol. 6, no. 9, pp. 576–578, Sep. 2014.