PACS:31.15.−p, 32.30.−r (all) DOI:10.1070/PU1970v013n03ABEH004259 URL: https://ufn.ru/en/articles/1970/3/f/ Citation: Novikov L N, Pokazan’ev V G, Skrotskii G V "Coherent phenomena in systems interacting with resonant radiation" Sov. Phys. Usp.13 384–399 (1970)