@article {25307,
	title = {Free-electron-driven multi-frequency terahertz radiation on a super-grating structure},
	journal = {IEEE Access},
	volume = {7},
	year = {2019},
	pages = {181184~- 181190},
	author = {Juan-Feng Zhu and Chao-Hai Du* and Fan-Hong Li and Lu-Yao Bao and Pu-Kun Liu}
}
