Source: https://www.researchgate.net/profile/Christophe-Petit-7/publication/49130878_L'eau_sur_le_site_d'Alesia_la_contrainte_hydrogeologique_lors_du_siege_de_52_av_J-C/links/560abd0608ae576ce640e3bd/Leau-sur-le-site-dAlesia-la-contrainte-hydrogeologique-lors-du-siege-de-52-av-J-C.pdf