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- [3] PLASTICS FOR WATER COOLING TOWERS IN REFINERIES ERDOL UND KOHLE ERDGAS PETROCHEMIE, 1966, 19 (11): : 823 - &
- [5] FISCAL TREATMENT OF OIL REFINERIES AND OIL BONDS BULLETIN FOR INTERNATIONAL FISCAL DOCUMENTATION, 1976, 30 (05): : 193 - 206