C.  Maurizio, Cesca, T., Trapananti, A., Kalinic, B., Scian, C., Mazzoldi, P., Battaglin, G., and Mattei, G., ?Effect of ultrasmall Au-Ag aggregates formed by ion implantation in Er-implanted silica on the 1.54 mu m Er3+ luminescence?, Nuclear Instruments & Methods In Physics Research Section B-beam Interactions With Materials and Atoms, vol. 326, pp. 11?14, 2014.