Cornélio, M. L. “Electron Transfer by Singlet Excited State of Porphyn and Electron Acceptor Affinity in Rigid Medium: Photoacoustic Phase Angle Analysis”. Eclética Química, vol. 22, no. 1, Dec. 1997, pp. 83-92, doi:10.26850/1678-4618eqj.v22.1.1997.p83-92.