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2. ISO 2859, Sampling procedures for inspection by attributes. ISO (1999). https://www.iso.org/obp/ui/#iso:std:iso:2859:-1:ed-2:v1:en
3. EN 15778:2011, Solid biofuels. Sampling. BSI (2011)
4. EN 14780:2011, Solid biofuels. Sample preparation. BSI (2011)
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