Zilhão, João. «The Stylistically Paleolithic Petroglyphs of the Côa Valley (Portugal) Are of Paleolithic Age. A Refutation of Their “direct Dating” to Recent Times». Trabalhos De Antropologia E Etnologia, vol. 35, n. 4, Outubro de 2020, http://84.247.136.72/ojsletrasX/index.php/tae/article/view/9551.