Iron(II)-tetra-'omicron'-ure´phenylporphyrinosilica obtained by a sol-gel process: a study of EPR, surface area and catalytic activity - Biazzotto, Juliana Cristina; Vidoto, Ednalva Aparecida; Nascimento, Otaciro Rangel; Iamamoto, Yassuko; Serra, Osvaldo Antonio (Journal of Non-Crystalline Solids, 2002)