PACS:32.80.Bx, 39.30.+w (all) DOI:10.1070/PU1973v015n04ABEH004995 URL: https://ufn.ru/en/articles/1973/4/f/ Citation: Pokozan’ev V G, Skrotskii G V "Crossing and anticrossing of atomic levels and their use in atomic spectroscopy" Sov. Phys. Usp.15 452–470 (1973)