DIN EN 15705:2010 肥料. 使用高效液相色譜法(HPLC)測定尿素冷凝物. 異丁叉二脲和巴豆叉二脲(方法A)和亞甲脲低聚物(方法B). 德文版本EN 15705: 2010
Fertilizers - Determination of urea condensates using high-performance liquid chromatography (HPLC) - Isobutylidenediurea and crotonylidenediurea (method A) and methylene-urea oligomers (method B); German version EN 15705:2010