PaperOptical and electron-spin-resonance spectra of Yb3+, Nd3+, and Cr3+ in LiNbO3 and LiTaO3Gerald Burns, D.F. O'Kane, et al.Physical Review
PaperRecombination radiation and stimulated emission in GaAsMarshall I. NathanSolid-State Electronics
PaperInfluence of covalency upon rare-earth ligand field splittingsJ.D. Axe, Gerald BurnsPhysical Review