V. B. Zabolotnyy, S. V. Borisenko, A. A. Kordyuk, J. Fink, J. Geck, A. Koitzsch, M. Knupfer, B. Buechner, H. Berger, A. Erb, C. T. Lin, B. Keirner, R. Follath: Effect of Zn and Ni impurities on the quasiparticle renormalization in Bi2Sr2CaCu2O8+delta. 2007Physica C-Superconductivity and Its Applications: 460. ISBN 0921-4534 http://dx.doi.org/10.1016/j.physc.2007.03.179