Two-photon Coherence and Steady-state Saturated and Inverted Populations in Three-level Systems.Published in:Journal of Modern Optics, 1991, v. 38, n. 9, p. 1739, doi. 10.1080/09500349114551871By:Boublil, S.;Wilson-Gordon, A.D.;Friedmann, H.Publication type:Article