PACS:76.80.+y DOI:10.1070/PU1984v027n07ABEH004044 URL: https://ufn.ru/en/articles/1984/7/g/ Citation: Rebane K K "Phononless lines in laser spectroscopy of molecules and crystals. 1. The phononless line — an optical analog of the Mössbauer line" Sov. Phys. Usp.27 541–543 (1984)