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- [36] POSSIBLE TECHNICAL DEVELOPMENTS IN FIELD OF SPECIAL COKES ERDOL UND KOHLE ERDGAS PETROCHEMIE VEREINIGT MIT BRENNSTOFF-CHEMIE, 1971, 24 (04): : 251 - &
- [37] Pipeline & Gas Journal's 2004 international pipeline construction report 1600, Oildom Publishing Co. of Texas Inc. (231):