Distribution of Iridium in Different Size Fractions at the N/Q Boundary in Loess:Implications for an Asteroid Impact 2.4 Ma Ago
MA Peixue,HOU Quanlin,CHAI Chifang,XU Heling,WU Xihao
Acta Scientiarum Naturalium Universitatis Pekinensis . 1998, (6): 775 -782 . 

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