Search for PeVatrons at the Galactic Center using a radio air-shower array at the South PoleA. Balagopal V., A. Haungs, T. Huege and F. G. SchröderEur. Phys. J. C, 78 2 (2018) 111DOI: https://doi.org/10.1140/epjc/s10052-018-5537-2