1. T. Gorishyy, M. Maldovan, C. Ullal, E. Thomas, Sound ideas. Phys. World 18(2), 24–29 (2005)
2. M.N. Armenise, C.E. Campanella, C. Ciminelli, F. dell’Olio, V.M.N. Passro, Photonic and phononic band gap structures: modeling and applications. Phys. Procedia 3, 357–364 (2010)
3. D. Torrent, J. Sanchez-Dehesa, Radial wave crystals: radially periodic structures from anisotropic metamaterials for engineering acoustic or electromagnetic waves. Phys. Rev. Lett. 103(064301), 1–4 (2009)
4. L. Fok, X. Zhang, Negative acoustic index metamaterial. Phys. Rev. B 83(214304), 1–8 (2011)
5. I. El- Kady, R. H. Olsson III, P. E. Hopkins, Z. C. Leseman, D. F. Goettler, B. Kim, M. R. Charles, F. Su. Mehmet, Phonon Manipulation with Phononic Crystals, Sandia National laboratories, SAND-0127 (2012)