[5] Bechtel A, Gratzer R, Sachsenhofer R F. International Journal of Coal Geology, 2001, 46: 27.
[6] Watts S, Pollard A M. Journal of Archaeological Science, 1999, 26: 923.
[5] Bechtel A, Gratzer R, Sachsenhofer R F. International Journal of Coal Geology, 2001, 46: 27.
[6] Watts S, Pollard A M. Journal of Archaeological Science, 1999, 26: 923.
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