P.  Mahato, Saha, S., Suresh, E., Di Liddo, R., Parnigotto, P. Paolo, Conconi, M. Teresa, Kesharwani, M. K., Ganguly, B., and Das, A., ?Ratiometric detection of Cr3+ and Hg2+ by a naphthalimide-rhodamine based fluorescent probe?, Inorganic Chemistry, vol. 51, no. 3, pp. 1769?1777, 2012.