Applying electrical resistivity tomography to the identification of endokarstic geometries in the Pleistocene sites of the Sierra de Atapuerca (Burgos, Spain) - Ortega Martínez, Ana Isabel; Benito-Calvo, Alfonso; Porres Benito, José Angel; Pérez-González, Alfredo; Martín-Merino, Miguel Ángel (2010)