Librantz, André Felipe Henriques, et al. “The Role of Nd3+ in the Population Inversion Between 1G4 and 3H6 States of Tm3+ in Yb:Nd:Tm:YLF Crystal”. Exacta, vol. 5, nº 1, junho de 2007, p. 113-8, doi:10.5585/exacta.v5i1.1035.