KLW rekenregels 2023
NEMA methoden
PEFCR
http://ec.europa.eu/environment/eussd/smgp/pdf/PEFCR_guidance_v6.3.pdf
Feed
http://ec.europa.eu/environment/eussd/smgp/pdf/PEFCR_feed.pdf
Dairy Products
http://ec.europa.eu/environment/eussd/smgp/pdf/PEFCR-DairyProducts_2018-04-25_V1.pdf