Arnaiz-Villena, A., V. Ruiz-del-Valle, I. Juarez, C. Vaquero-Yuste, J. M. Martín-Villa, and T. Lledó. “Lineal Upper Paleolithic Scripts More Ancient Than Some Figures in Altamira Cave (Santander, Spain) Are Similar to Those Found in Sahara and Canary Islands”. International Journal of Modern Anthropology, vol. 3, no. 25, Jan. 2026, pp. 412-38, doi:10.4314/ijma.v3i25.5.