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Katherine R. Tsiang, Monumentalization of Buddhist Texts in the Northern Qi Dynasty: The Engraving of Sūtras in Stone at the Xiangtangshan Caves and Other Sites in the Sixth Century, Artibus Asiae, Vol. 56, No. 3/4 (1996), pp. 233-261
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Katherine R. Tsiang (1996) studied this question.
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