Spectral cut-off in the efficiency of the resistive state formation caused by absorption of a single-photon in current-carrying superconducting nano-stripsA. Semenov, A. Engel, H.-W. Hübers, K. Il'in and M. SiegelEur. Phys. J. B, 47 4 (2005) 495-501DOI: https://doi.org/10.1140/epjb/e2005-00351-8