TY - CPAPER TI - Different oxidation states on chromium-containing silica PY - 1998 AU - Martines, Marco Antonio Utrera AU - Davolos, Marian Rosaly AU - Jafelicci Junior, Miguel AU - Alexiou, Anamaria Dias Pereira AU - Toma, Henrique Eisi T2 - Brazilian Meeting on Inorganic Chemistry PP - Angra dos Reis ER -