[1] Poulin J, Helwig K. Analytical Chemistry, 2014, 86(15): 7428.
[2] Sadowski E M, Schmidt A R, Rudall P J, et al. Review of Palaeobotany and Palynology, 2016, 233: 161.
[5] Abduriyim A, Kimura H, Yokoyama Y, et al. Gems & Gemology, 2009, 45(3): 158.
[7] Poulin J, Helwig K. Organic Geochemistry, 2015, 86: 94.
[8] Pastorelli G, Shashoua Y, Richter J. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2013, 106: 124.