The nature of black stains in Lascaux Cave, France, as revealed by surface-enhanced Raman spectroscopy - Martin-Sanchez, P.M.; Sanchez-Cortes, S.; Lopez-Tobar, E.; Jurado, V.; Bastian, F.; Alabouvette, C.; Saiz-Jimenez, C. (Journal of Raman Spectroscopy, 2012)