NS-EN ISO 20483:2006 Cereals and pulses — Determination of the nitrogen content and calculation of the crude protein content — Kjeldahl method (ISO 20483:2006)
2014NS-EN ISO 20483:2013 Cereals and pulses — Determination of the nitrogen content and calculation of the crude protein content — Kjeldahl method (ISO 20483:2013)
2007NS-EN ISO 20483:2006 Cereals and pulses — Determination of the nitrogen content and calculation of the crude protein content — Kjeldahl method (ISO 20483:2006)