prevention and control in the European fertilizer industry. Booklet No. 7 of 8: Production of NPK fertilizers by the nitrophosphate route" (PDF). www.fertilizerseurope
Publications. pp. 643–4. ISBN 978-1-879906-54-9. {{cite book}}: |access-date= requires |url= (help); External link in |chapterurl= (help); Unknown parameter