@article {9431,
	title = {Highly anisotropic anomaly in the dispersion of the copper-oxygen bond-bending phonon in superconducting YBa2Cu3O 7 from inelastic neutron scattering},
	journal = {Physical Review Letters},
	year = {2011},
	doi = {10.1103/PhysRevLett.107.177004},
	author = {M. Raichle and D. Reznik and D. Lamago and R. Heid and Y. Li and M. Bakr and C. Ulrich and V. Hinkov and K. Hradil and C.T. Lin and B. Keimer}
}
