Raman spectroscopic analysis of a tembeta: a resin archaeological artefact in need of conservation - Faria, Dalva Lúcia Araújo de; Edwards, Howell G. M.; Afonso, Marisa Coutinho; Brody, Rachel H.; Morais, José Luiz de (Spectrochimica Acta Part A - Molecular and Biomolecular Spectroscopy, 2004)