Aggregation of meso-tetrakis(4-N-methyl-pyridiniumul) porphyrin in its free base, Fe(III) and Mn(III) forms due to the interaction with DNA in aqueous solutions: optical absorption, fluorescence and light scattering studies - Gandini, Shirley de Cássia Monte; Borissevitch, Iouri E; Perussi, Janice Rodrigues; Imasato, Hidetake; Tabak, Marcel (Journal of Luminescence, 1998)