Ryabchun, S. A., Tretyakov, I. V., Finkel, M. I., Maslennikov, S. N., Kaurova, N. S., Seleznev, V. A., et al. (2008). Fabrication and characterisation of NbN HEB mixers with in situ gold contacts. In _Proc. 19th Int. Symp. Space Terahertz Technol._ (pp. 62–67). Groningen, Netherlands.