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- [2] UNDERGROUND RESERVOIR OF CRUDE-OIL, CRUDE-OIL PRODUCTS AND GASES ERDOL & KOHLE ERDGAS PETROCHEMIE, 1975, 28 (08): : 371 - 372
- [4] MORE ON ESTIMATION OF DEMAND FOR CRUDE-OIL REVIEW OF BUSINESS AND ECONOMIC RESEARCH, 1977, 13 (01): : 108 - 110