F. Venturini, M. Opel, TP. Devereaux, JK. Freericks, I. Tutto, B. Revaz, E. Walker, H. Berger, L. Forro, R. Hackl: Observation of an unconventional metal-insulator transition in overdoped CuO2 compounds. 2002Physical Review Letters: 89. ISBN 0031-9007 http://dx.doi.org/10.1103/PhysRevLett.89.107003