Non-invasive and non-destructive Raman spectroscopic characterization of some Brazilian ethnographic resins - Faria, Dalva Lúcia Araújo de; Maier, Marta S; Parera, Sara D; Afonso, Marisa Coutinho; Lima, Silvia Cunha; Edwards, Howell G. M (Journal of Raman Spectroscopy, 2021)