Propagation properties of elastic waves in semi-infinite phononic crystals and related waveguides Y. W. Yao, F. G. Wu, Z. L. Hou and Y. Y. Liu Eur. Phys. J. B, 58 4 (2007) 353-360 Published online: 22 September 2007 DOI: 10.1140/epjb/e2007-00244-x