VB. Zabolotnyy, SV. Borisenko, AA. Kordyuk, J. Fink, J. Geck, A. Koitzsch, M. Knupfer, B. Buchner, H. Berger, A. Erb, CT. Lin, B. Keimer, R. Follath: Effect of Zn and Ni impurities on the quasiparticle renormalization of superconducting Bi-2212. 2006Physical Review Letters: 96. ISBN 0031-9007 http://dx.doi.org/10.1003/PhysRevLett.96.037003