1. Q.X Wu, J.P. Wang, D. Che, and Y. Gu, Situation analysis and sustainable development suggestions of vanadium resources in china, Resour. Ind., 2016, No. 3, p. 29.
2. S. Li, Study on China’s Iron Ore Import and Countermeasures [Dissertation], Dongbei University of Finance and Economics, Dalian, 2010.
3. D.B. Zhang, H.M. Wan, and J. Zheng, Analysis on global iron ore resources and China’s iron ore supply and demand, China Metall., 2004, No. 6, p. 26.
4. F.K. Meng, Current status and prospects of utilization of titanium resources in Chengde, Titanium Ind.Prog., 2001, No. 5, p. 11.
5. J.M. Ma and C.X. Cheng, New types of development and utilization of iron ore resources in China—Ultra-lean vanadium-titanium magnetite of Chengde, Land Resour. Inf., 2006, No. 11, p. 53.