[2] Hosler D. World Archaeology, 1995, 27(1): 100.
[4] Thiel R. Magazine for Inorganic Chemistry, 1963, (326): 70.
[5] Fitzpatrick R W, Schwertmann U. Geoderma, 1982, 27: 335.
[6] Bouchard M, Smith D C. Spectrochimica Acta Part A, 2003, 59: 2247.
[7] Kustova G N, Burgina E B, Sadykov V A, et al. Physics and Chemistry of Minerals, 1992, 18: 379.
[8] Smith D C, Bouchard M, Lorblanchet M. Journal of Raman Spectroscopy. 1999, 30: 347.
[9] Burgio L, Clark R J H. Spectrochimica Acta Part A, 2001, 57: 1491.
[10] Faria D L A D, Silva S V, Oliveira M T D. Journal of Raman Spectroscopy, 1997, 28: 873.
[11] Bell I M, Clark R J H, Gibbs P J. Spectrochimica Acta Part A, 1997, 53: 2159.
[12] Jin Z Y, Wu Y J, Li G, et al. Quaternary Geochronology, 2012, 10: 387.