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- [6] The technological development of crude oil refinery processes at the PKN Orlen SA PRZEMYSL CHEMICZNY, 2003, 82 (8-9): : 1298 - 1302
- [7] Orlen has sold part of its shares in Gdansk Refinery PRZEMYSL CHEMICZNY, 2022, 101 (12): : 1056 - 1056