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URL: https://scholar.google.com/scholar_lookup?author=Hu%20Y.&author=Li%20B.&author=Liu%20J.H.&author=Luo%20X.R.&author=Ruan%20Q.J.&author=Yang%20C.C.&journal=Acta%20Anthropologica%20Sinica&publication%20year=2019&title=A%20study%20of%20stone%20artifacts%20found%20in%20the%20Tianhuadong%20Paleolithic%20site%2C%20Heqing%2C%20Yunnan&volume=38