“Thermal Conductivity of Ge-doped silica thin films evaluated by the photothermal beam deflection technique” F.J. Macedo, A.G. Rolo, J.A. Ferreira, M.J.M. Gomes “Gordon Research Conference on Photoacoustic and Photothermal Phenomena”, Colby-Sawyer College, New London, New Hampshire, USA, 27 de Junho a 2 Julho de 1999.