J. Paoli, A. Ternesten Bratel, G. Löwhagen, B. Stenquist, O. Forslund, and A. Wennberg, “Penile intraepithelial neoplasia: results of photodynamic therapy”, Acta Derm Venereol, vol. 86, no. 5, pp. 418–421, Sep. 2006.