Abreu, P., Aglietta, M., Albury, J., and 374 more, i., & Biermann, P. (2021). The energy spectrum of cosmic rays beyond the turn-down around 10^17 eV as measured with the surface detector of the Pierre Auger Observatory. European Physical Journal C, 81(11): 966, pp. 966. doi:10.1140/epjc/s10052-021-09700-w.