PT Unknown AU Maslennikov, S Vachtomin, Y Antipov, S Smirnov, K Kaurova, N Grishina, E Voronov, B Gol'tsman, G TI NbN HEB mixers for frequencies of 2.5 and 3.8 THz SE Proc. Tenth All-Russian sceintific conference of student-physicists and young sceintists (VNKSF-10) PY 2004 PI Moscow ER