Rodrigues S.E., Machado A.E.H., Berardi M., Ito A.S., Almeida L.M., Santana M.J., Liao L.M., Neto N.M.Barbosa, çalves P.J..  2015.  Investigation of protonation effects on the electronic and structural properties of halogenated sulfonated porphyrins. Journal of Molecular Structure. 1084:284-293.

çalves P.J., Franzen P.L., Correa D.S., Almeida L.M., Takara M., Ito A.S., ílio S.C., Borissevitch I.E..  2011.  Effects of environment on the photophysical characteristics of mesotetrakis methylpyridiniumyl porphyrin (TMPyP). Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 79(5):1532-1539.