1. Rationalization of crystal-field parameterization;Görller-Walrand,1996
2. Spectral intensities of f–f transitions;Görller-Walrand,1998
3. 4fN→ 4fN−15d transitions;Burdick,2007
4. Termaufspaltung in Kristallen;Bethe;Ann. Phys.,1929
5. Electron Paramagnetic Resonance of Transition Ions;Abragam,1970