M. Opel, R. Nemetschek, C. Hoffmann, R. Philipp, PF. Muller, R. Hackl, I. Tutto, A. Erb, B. Revaz, E. Walker, H. Berger, L. Forro: Carrier relaxation, pseudogap, and superconducting gap fn high-T-c cuprates: A Raman scattering study. 2000Physical Review B: 61. ISBN 1098-0121 http://dx.doi.org/10.1103/PhysRevB.61.9752