Ionization effects on spectral signatures of quantum-path interference in high-harmonic generation - Holler, MH; Zair, AZ; Schapper, FS; Auguste, TA; Cormier, EC; Wyatt, ASW; Monmayrant, AM; Walmsley, IAW; Gallmann, LG; Salieres, P; Keller, UK (Optics Express, 2009)