Palomo A, Blanco-Várela M, Herrero P, Prendes N. Rupestral paintings of the "La Graja" cave. Pigment characterization and digital image analysis. materconstrucc [Internet]. 2004Mar.30 [cited 2023Sep.27];54(273):57-72. Available from: https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/223