Two-photon absorption in azoaromatic compounds - De Boni, Leonardo; Rodrigues Junior, José Joatan; Santos Junior, David Sotero; Silva, C H T P; Balogh, Débora Terezia; Oliveira Junior, Osvaldo Novais de; Zílio, Sérgio Carlos; Misoguti, Lino; Mendonça, Cleber Renato (Chemical Physics Letters, 2002)