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- [4] FEEDBACK - OUTLOOK FOR NATURAL-GAS - ALLOCATIONS ARE IN YOUR FUTURE FOOD ENGINEERING, 1975, 47 (07): : 39 - 39
- [5] NATURAL-GAS HYDRATES - NATURAL-GAS IN WATER CAGES ERDOL & KOHLE ERDGAS PETROCHEMIE, 1994, 47 (10): : 360 - &