Subhash Chandra Bose Kotte, Ramakoteswara Rao CH, Vijaya Kumar Tulam, Shriram Raghavan, Dubey P. K., and Murali P. M., “Qualitative analysis of Gefitinib by Quadrupole –Time of Flight (LCMS) Coupled with PDA and ELSD Detectors, using dual Electrospray Ionization”, Int. J. Res. Pharm. Sci., vol. 3, no. 1, pp. 113–119, Mar. 2012.