Verevkin A, Xu Y, Zheng X, Williams C, Sobolewski R, Okunev O, et al. Superconducting NbN-based ultrafast hot-electron single-photon detector for infrared range. In: Proc. 12<sup>th</sup> Int. Symp. Space Terahertz Technol.; 2001. p. 462&ndash;8.