Geological risk assessment of the area surrounding Altamira Cave: a proposed natural risk index and safety factor for protection of prehistoric caves

by Foyo, Alberto, Iriarte, Eneko, Sánchez, Miguel A., Tomillo, Carmen
Source: 1. Engineering geology 1. 0013-7952 1. Roč. 94, č. 3-4 (november 2007), s. 180-200