Librantz, A.F.H. et al. 2008. Investigation of energy shift of 4f3 and 4f25d levels in Nd-doped YLF and LLF crystals 1 2. Exacta. 4, 1 (mar. 2008), 123–128. DOI:https://doi.org/10.5585/exacta.v4i1.661.