Plasmonic enhancement of second harmonic generation from nonlinear RbTiOPO4 crystals by aggregates of silver nanostructures - Sánchez-García L., Tserkezis C., Ramírez M., Molina P., Carvajal J., Aguiló M., Díaz F., Aizpurua J., Bausá L. (Optics Express, 2016)