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- [7] ON THE FEASIBILITY OF VOLUNTARY FOREST CERTIFICATION WATER RESOURCES, FOREST, MARINE AND OCEAN ECOSYSTEMS CONFERENCE PROCEEDINGS, SGEM 2016, VOL II, 2016, : 589 - 594
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- [10] System for voluntary certification at 'Gazprom' JSC Gazovaya Promyshlennost, 2001, (07): : 16 - 19