Petelin, M., Erckmann, V., Hirshfield, J. L., Kasparek, W., Shchegolkov, D., & Tolkachev, A. (2009). New Concepts for Quasi-Optical Structures for Use with Gyrotron Systems. IEEE Transactions on Electron Devices, 56(5), 835-838. doi:10.1109/TED.2009.2015626.