Recent results on THz gyrotron-based molecular spectroscopy G.Yu. Golubiatnikov, M.A. Koshelev, A.I. Tsvetkov, A.P. Fokin, M.Yu. Glyavin and M.Yu. Tretyakov EPJ Web Conf., 195 (2018) 06017 Published online: 23 November 2018 DOI: 10.1051/epjconf/201819506017