Gurin, O. V., Degtyarev, A. V., Dubinin, M. M., Maslov, V. A., Muntean, K. I., Ryabykh, V. M., Svystunov, O. O. and Senyuta, V. (2022) “Selection and focusing of higher-order modes in a CW waveguide terahertz laser”, Visnyk of V.N. Karazin Kharkiv National University, series “Radio Physics and Electronics”, (36), pp. 74-86. doi: 10.26565/2311-0872-2022-36-06.