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- RAFATI, Reza. An econometric model of the world cobalt industry. Kiel : Institut für Weltwirtschaft, 1982. 72 s. Working Paper, no. 163. [Copy count : 1, currently available 0, at library only 0]
- GUPTA, Poonam. An econometric model of the world cobalt industry. Kiel : Universität, 1981. 123 s. Working Paper, no. 129. [Copy count : 1, currently available 1, at library only 0]