Source: https://www.researchgate.net/profile/Clemence-Duenner-Louvard-2/publication/237528199_Mesures_de_contraintes_dans_un_versant_rocheux_predispose_aux_instabilites/links/5654805608aefe619b19ec32/Mesures-de-contraintes-dans-un-versant-rocheux-predispose-aux-instabilites.pdf