[1] Shi G H, Grimaldi D A, Harlow G E, et al. Cretaceous Research, 2012, 37: 155.
[3] Follett Thelma. Archaeology, 1985, 38(2): 64.
[4] Stephan V, Klaus B, Pieter G, et al. Antiquity, 2012, 86(333): 660.
[5] Liu Y, Shi G H, Wang S. Gems & Gemology, 2014, 50(2): 134.
[6] Pastorelli G. Journal of Cultural Heritage, 2011, 12(2): 164.
[7] Murillo-Barroso M, Martinón-Torres M, Sanjuán L G, et al. Journal of Archaeological Science, 2015, 57: 322.
[8] Truic G I, Teodor E D, Teodor E S, et al. Journal of Archaeological Science, 2012, 39(12): 3524.
[9] Teodor E S, Teodor E D, Virgolici M, et al. Journal of Archaeological Science, 2010, 37(10): 2386.
[11] Wang Yamei, Yang Mingxing, Yang Yiping. Gems & Gemmology, 2014, 50(2): 142.