"渤海国文物古迹之龙头山古墓群" [Cultural remains of the Balhae Kingdom:the ancient tombs at Longtou Mountain]. Chamgbai Mountain. 16 July 2012. Archived from the original on 6 March 2021. Retrieved 29 September 2017.
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"渤海国文物古迹之龙头山古墓群" [Cultural remains of the Balhae Kingdom:the ancient tombs at Longtou Mountain]. Chamgbai Mountain. 16 July 2012. Archived from the original on 6 March 2021. Retrieved 29 September 2017.