DIN EN ISO 5378:1994
淀粉及其制品.用克耶达(Kjeldahl)法测定氮含量.分光光度法 (ISO 5378:1978); 德文版本 EN ISO 5378:1994
Starches and derived products - Determination of nitrogen content by the Kjeldahl method - Spectrophotometric method (ISO 5378:1978); German version EN ISO 5378:1994