B. De Caprariis, P. De Filippis, A. Di Battista, L. Di Palma, and M. Scarsella, “Exoelectrogenic Activity of a Green Microalgae, Chlorella vulgaris, in a Bio-Photovoltaic Cells (BPVs)”, Chemical Engineering Transactions, vol. 38, pp. 523-528, Sep. 2014.