Liu, Hongli
Wang, Xudong
Guo, Qinglin
Zhang, Mingquan
Wang, Yanwu
Funding for this research was provided by:
the key research and development plan of Gansu province (No. 17YF1FF104)
the project of the Gansu provincial cultural relics bureau (201608)
The major special projects of Gansu province (No. 18ZD2FA001)
Article History
Received: 22 February 2019
Accepted: 16 October 2019
First Online: 14 November 2019