Asymmetric local displacements in the Bi2Sr2CaCu2O8+δ superconductor N. L. Saini, A. Lanzara, A. Bianconi and H. Oyanagi Eur. Phys. J. B, 18 2 (2000) 257-261 Published online: 15 November 2000 DOI: 10.1007/s100510070056