Several mechanisms for emission of electromagnetic radiation by relativistic electrons in various media which are of interest for generating intense ultraviolet, x-ray, and $\gamma$ radiation are examined. Theoretical and experimental results on ultraviolet and x-ray Cherenkov radiation, quasi-Cherenkov radiation in artificial periodic structures, radiation from crystals which results from the diffraction of virtual photons, and radiation accompanying channeling are discussed.

@article{Bazylev:1982,
	author = {V. A. Bazylev and N. K. Zhevago},
	title = {Intense electromagnetic radiation from relativistic particles},
	publisher = {Physics-Uspekhi},
	year = {1982},
	journal = {Phys. Usp.},
	volume = {25},
	number = {8},
	pages = {565-595},
	url = {https://ufn.ru/en/articles/1982/8/b/},
	doi = {10.1070/PU1982v025n08ABEH004588}
}