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- [5] LONG-TERM STRATEGIES TO IMPROVE ENERGY EFFICIENCY ERDOL & KOHLE ERDGAS PETROCHEMIE, 1987, 40 (10): : 419 - 420
- [8] LONG-TERM AND SHORT-TERM ANALYSIS OF THE NATURAL-RUBBER MARKET WELTWIRTSCHAFTLICHES ARCHIV-REVIEW OF WORLD ECONOMICS, 1989, 125 (04): : 718 - 747