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, vol. 6, n.º 21, noviembre de 2014, pp. pp. 927-936, doi:10.70748/ba.21.2014.275.