1992Refereed publicationLeyser, T BThide, BGoodman, SWaldenvik, MVeszelei, EGrach, S MKarashtin, A NKomrakov, G PKotik, D S(1992) Narrow cyclotron harmonic absorption resonances of stimulated electromagnetic emission in the ionosphere. \textbackslashtextbackslashprl. DOI: 10.1103/PhysRevLett.68.3299