Impedance measurements for photon number resolving Transition-Edge Sensors E. Taralli, C. Portesi, L. Lolli, M. Rajteri, E. Monticone, I. Novikov and J. Beyer Eur. Phys. J. Plus, 127 2 (2012) 13 Published online: 06 February 2012 DOI: 10.1140/epjp/i2012-12013-3