Liu, Hongli
Wang, Xudong
Guo, Qinglin
Funding for this research was provided by:
the key research and development plan of Gansu province (No. 17YF1FF104)
a project of the Gansu provincial cultural relics bureau (201608)
the major special project of Gansu province (No. 18ZD2FA001)
Article History
Received: 11 February 2019
Accepted: 7 November 2019
First Online: 17 November 2019