F.  Matusalem, Marques, M., Teles, L. K., Filippetti, A., and Cappellini, G., ?Electronic properties of fluorides by efficient approximated quasiparticle DFT-1/2 and PSIC methods: BaF2, CaF2 and CdF2 as test cases?, Journal of Physics Condensed Matter, vol. 30, 2018.