Baselmans, J., Kooi, J., Baryshev, A., Yang, Z. Q., Hajenius, M., Gao, J. R., et al. (2005). Full characterization of small volume NbN HEB mixers for space applications. In _Proc. 16<sup>th</sup> Int. Symp. Space Terahertz Technol._ (pp. 457&ndash;462). Göteborg, Sweden.