Distinguishing amber and copal classes by proton magnetic resonance spectroscopyDOI: info:10.1111/j.1475-4754.2011.00625.xv. 54No. 2Published by Blackwell for the University of Oxford332–348
Lambert, J. B., Tsai, C. Y. H., Shah, M. C., Hurtley, A. E., and Santiago-Blay, Jorge A. 2012. "Distinguishing amber and copal classes by proton magnetic resonance spectroscopy." Archaeometry, 54, (2) 332–348. https://doi.org/10.1111/j.1475-4754.2011.00625.x.