Photochromic complexes of ormosil xerogels studied by solid-state nuclear magnetic resonance - Oliveira Junior, Marcos de; Schneider, José Fabian; Rodrigues Filho, Ubirajara Pereira; Souza, Adriano Lopes de; Carvalho, Flávio Luiz S. de; Brandão, Renata (Brazilian MRS Meeting, 2010)