TP. Devereaux, A. Virosztek, A. Zawadowski, M. Opel, PF. Muller, C. Hoffmann, R. Philipp, R. Nemetschek, R. Hackl, A. Erb, E. Walker, H. Berger, L. Forro: Enhanced electron-phonon coupling and its irrelevance to high T-c superconductivity. 1998Solid State Communications: 108. ISBN 0038-1098 http://dx.doi.org/10.1016/S0038-1098(98)00424-4