R. Eglitis, A. I. Popov, J. Purans, and Ran Jia, First principles hybrid Hartree–Fock–DFT calculations of bulk and (001) surface F centers in oxide perovskites and alkaline-earth fluorides, Low Temp. Phys. 46, (2020) [Fiz. Nizk. Temp. 46, 1418-1425, (2020)] DOI: https://doi.org/10.1063/10.0002475.