Usai, D., Maritan, L., Dal Sasso, G., Artioli, G., Salvatori, S., Jakob, T., & Salviato, T. (2017). Late Pleistocene/Early Holocene Evidence of Prostatic Stones at Al Khiday Cemetery, Central Sudan. PLoS ONE, 12(1), Article e0169524. https://doi.org/10.1371/journal.pone.0169524