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D. Phillips; J.W. Harris. (2009). Diamond provenance studies from 40Ar/39Ar dating of clinopyroxene inclusions: An example from the west coast of Namibia. , 112(supp-S2), 793–805. doi:10.1016/j.lithos.2009.05.003 
10.1016/j.lithos.2009.05.003