Harmonic Generation in N2 and Ar by Wave-Mixing F. Giammanco, P. Ceccherini, C. Tagliavini, M. Malvezzi, P. Villoresi and G. Tondello Ann. Phys. Fr., 22 (1997) C1-69-C1-70 Published online: 15 February 1997 DOI: 10.1051/anphys/1997010