PACS:42.50.Gy, 42.50.Fx, 42.50.Ar, 42.50.Md, 42.50.Hz (all) DOI:10.1070/PU1986v029n11ABEH003540 URL: https://ufn.ru/en/articles/1986/11/d/ Citation: Leontovich A M, Mozharovskii A M, Trifonov E D "Coherent amplification, reflection, and induced superradiance in activated media." Sov. Phys. Usp.29 1058–1059 (1986)