Photoinduced birefringence in di-azo compounds in polystyrene and poly(methyl methacrylate) guest-host systems - Mendonça, Cleber Renato; Misoguti, Lino; Andrade, A. A.; Yamaki, S. B.; Dias, V. D.; Atvars, T. D. Z.; Oliveira Junior, Osvaldo Novais de (Optical Materials, 2007)