PACS:33.70.Jg, 33.20.Vq (all) DOI:10.1070/PU1973v015n05ABEH005045 URL: https://ufn.ru/en/articles/1973/5/l/ Citation: Letokhov V S "Nonlinear Narrow Molecular Resonances Induced by Laser Radiation, and Their Application in Spectroscopy and Quantum Electronics" Sov. Phys. Usp.15 665–666 (1973)