Valle, Raoni. «A “negative” View - the Post-Processing Enhancement of Rock Art Digital Image Using Inversion Tool and Brightness Contrast Levels – The Case of Petroglyphs at the Lower Negro River Basin, Brazilian Amazonia». Boletín APAR 6, no. 21 (noviembre 20, 2014): pp. 927–936. Accedido octubre 27, 2025. https://revistas.coarpe.org.pe/index.php/BoletinApar/article/view/275.