M.  Kar, Tiwari, N., Tiwari, M., Lahiri, M., and Gupta, S. Sen, ?Poly-L-arginine grafted silica mesoporous nanoparticles for enhanced cellular uptake and their application in DNA delivery and controlled drug release?, Particle & Particle Systems Characterization, vol. 30, no. 2, pp. 166-179, 2013.