@article{Radionov_2015 author = {V. P. Radionov and V. K. Kiseliov}, title = {CONICAL 90° MIRRORS FOR TERAHERTZ LASER RESONATOR}, journal = {Telecommunications and Radio Engineering}, issn = {0040-2508}, year = {2015}, volume = {74}, number = {4}, pages = {337--343} }