Photoacoustics and laser-ultrasonics applied to the characterization of a ZnO ceramic sample F. Enguehard, E. Lafond, D. Souche, M. Dubois, J.-C. Gonthier et L. Bertrand J. Phys. IV France, 04 C7 (1994) C7-697-C7-700 DOI: 10.1051/jp4:19947163