Semenov, A., Hübers, H. - W., Richter, H., Birk, M., Krocka, M., Mair, U., et al. (2002). Performance of terahertz heterodyne receiver with a superconducting hot-electron mixer. In _Proc. 13<sup>th</sup> Int. Symp. Space Terahertz Technol._ (pp. 229&ndash;234).