Direct measurement of the ionization quenching factor of nuclear recoils in germanium in the keV energy rangeA. Bonhomme, H. Bonet, C. Buck, J. Hakenmüller, G. Heusser, T. Hugle, M. Lindner, W. Maneschg, R. Nolte, T. Rink, E. Pirovano and H. StreckerEur. Phys. J. C, 82 9 (2022) 815DOI: https://doi.org/10.1140/epjc/s10052-022-10768-1