Femtosecond third-order nonlinear spectra of lead-germanium oxide glasses containing silver nanoparticles - De Boni, Leonardo; Barbano, Emerson Cristiano; Assumpção, Thiago Alexandre Alves de; Misoguti, Lino; Kassab, Luciana Reyes Pires; Zílio, Sérgio Carlos (Optics Express, 2012)