Spectroscopy and terahertz imaging for sigillography applications P. Mounaix, A. Younus, J.C. Delagnes, E. Abraham, L. Canioni and M. Fabre J. Eur. Opt. Soc.-Rapid Publ., 6 (2011) 11002 Published online: 22 February 2011 DOI: 10.2971/jeos.2011.11002