Vibrational coupling of nearly degenerate electronic statesWalter E. BronMax Wagner1966Physical ReviewPaper
Rare-earth ions in the alkali halides. III. Electron-lattice coupling and the details of the vibronic spectraW.E. BronMax Wagner1965Physical ReviewPaper
Rare-earth ions in the alkali halides. II. Pseudolocalized vibrational frequenciesMax WagnerW.E. Bron1965Physical ReviewPaper