G. C.  Vásquez, Maestre, D., Cremades, A., Ramírez-Castellanos, J., Magnano, E., Nappini, S., and Karazhanov, S. Z., ?Understanding the effects of Cr doping in rutile TiO2 by DFT calculations and X-ray spectroscopy?, Scientific Reports, vol. 8, 2018.