XRF analysis of ancient Numidian coins: a comparison between different kingdomsLynda Idjouadiene, Toufik A. Mostefaoui, Hocine Djermoune, Farid Ziat and Letizia BonizzoniEur. Phys. J. Plus, 136 5 (2021) 512DOI: https://doi.org/10.1140/epjp/s13360-021-01458-0