Induced superconductivity distinguishes chaotic from integrable billiards J. A. Melsen, P. W. Brouwer, K. M. Frahm and C. W.J. Beenakker Europhys. Lett., 35 1 (1996) 7-12 Published online: 01 September 2002 DOI: 10.1209/epl/i1996-00522-9