Ryabchun SA, Tretyakov IV, Finkel MI, Maslennikov SN, Kaurova NS, Seleznev VA, et al. Fabrication and characterisation of NbN HEB mixers with in situ gold contacts. In: Proc. 19^th Int. Symp. Space Terahertz Technol. Groningen, Netherlands; 2008. p. 62–7.