Photoacoustic investigations of optical absorption, photoluminescence, and thermal diffusivity of Porous Diamond-Like-Carbon films M. Ventura Conceição, O. Nakamura, A. Ferreira da Silva, L. Vieira Santos, V.J. Trava-Airoldi et L.S. Roman J. Phys. IV France, 125 (2005) 293-295 DOI: 10.1051/jp4:2005125070