Inverse proximity effect in superconductors near ferromagnetic material M. A. Sillanpää, T. T. Heikkilä, R. K. Lindell and P. J. Hakonen Europhys. Lett., 56 4 (2001) 590-595 Published online: 01 December 2003 DOI: 10.1209/epl/i2001-00561-8