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- [23] OIL PRICES - AFTER THE OPEC MEETING ERDOL & KOHLE ERDGAS PETROCHEMIE, 1982, 35 (04): : 197 - 197
- [26] RECOVERABLE RESERVES ARE AFFECTED BY OIL AND GAS PRICES. JPT, Journal of Petroleum Technology, 1981, 33 (01): : 33 - 38
- [30] OPEC - CONFERENCES, DECISIONS - LONG-TERM STRATEGY ERDOL & KOHLE ERDGAS PETROCHEMIE, 1986, 39 (09): : 393 - 393