Effect of protonation on the photophysical properties of meso-tetra(sulfonatophenyl) porphyrin - Gonçalves, P. J.; De Boni, Leonardo; Barbosa Neto, Newton Martins; Rodrigues Júnior, J. J.; Zílio, Sérgio Carlos; Borissevitch, Iouri (Chemical Physics Letters, 2005)