1. Agostini C (2006) Estimating market power in the US copper industry. Rev Ind Organ 28(1):17–39
2. Atchade DO, Thoms J (2006) The future of OPEC. Market dynamics and organizational challenges. Working Paper, Swiss Federal Institute of Technology, Lausanne
3. Barger H, Schurr SM (1944) The mining industries, 1899–1939: a study of output, employment, and productivity. National Bureau of Economic Research, New York
4. Birchard R (1940) Copper in the Katanga region of the Belgian Congo. Econ Geogr 16(4):429–436
5. Bittermann H (1934) Elasticity of supply. Am Econ Rev 24(3):417–429