Arnaiz-Villena A, Ruiz-del-Valle V, Juarez I, Vaquero-Yuste C, Martín-Villa JM, Lledó T. Lineal Upper Paleolithic scripts more ancient than some figures in Altamira Cave (Santander, Spain) are similar to those found in Sahara and Canary Islands . Int.J.Mod.Anthrop [Internet]. 2026 Jan. 14 [cited 2026 Jul. 31];3(25):412-38. Available from: https://www.ajol.info/index.php/ijma/article/view/314628