Spectroscopy and terahertz imaging for sigillography applicationsP. Mounaix, A. Younus, J.C. Delagnes, E. Abraham, L. Canioni and M. FabreJ. Eur. Opt. Soc.-Rapid Publ., 6 (2011) 11002DOI: https://doi.org/10.2971/jeos.2011.11002