Metallurgy at the crossroads: New analyses of copper-based objects at Tianshanbeilu, eastern Xinjiang, China - Cheng, L; Liu, R; Zhou, P; Lu, C; Cengxin, Y; Pollard, AM; Hommel, P; Ma, J; Cui, J; Bray, P; Tong, J; Rawson, J (Acta Geologica Sinica - English Edition, 2020)