Mapping of microwave-induced phonons by μ-Brillouin spectroscopy: Hypersound in ZnO on Silicon J. Mainka, L. Le Brizoual, J.K. Krüger, O. Elmazria, B. Vincent, D. Rouxel, P. Alnot and R. Sanctuary J. Phys. IV France, 129 (2005) 61-63 DOI: 10.1051/jp4:2005129013