Second harmonic generation in Ga nanoparticle monolayers A. M. Malvezzi, M. Patrini, A. Stella, P. Tognini, P. Cheyssac and R. Kofman Eur. Phys. J. D, 16 1-3 (2001) 321-324 Published online: 15 September 2001 DOI: 10.1007/s100530170120