Enhanced frequency upconversion in Er3+-doped sodium lead tellurite glass containing silver nanoparticlesM. Reza Dousti, M.R. Sahar, Raja J. Amjad, S.K. Ghoshal, A. Khorramnazari, A. Dordizadeh Basirabad and A. SamavatiEur. Phys. J. D, 66 9 (2012) 237DOI: https://doi.org/10.1140/epjd/e2012-30089-1