Yagoubov, P., Gol'tsman, G., Voronov, B., Svechnikov, S., Cherednichenko, S., Gershenzon, E., et al. (1996). Quasioptical phonon-cooled NbN hot-electron bolometer mixer at THz frequencies. In _Proc. 7<sup>th</sup> Int. Symp. Space Terahertz Technol._ (pp. 303&ndash;317).