Experimental demonstration of surface phonon focusing in anisotropic media using laser induced acoustic pulses Al.A. Kolomenskii, A.A. Masnev, V.G. Mikhalevich and H.A. Schuessler J. Phys. IV France, 04 C7 (1994) C7-721-C7-723 DOI: 10.1051/jp4:19947169