1. Conversion of by-product gypsum to a-hemihydrate by ICI's process;Allen;Phosphorus Potassium,1975
2. Kellogg details progress in phosphoric acid;Anonymous;Eur. Chem. News,1972a
3. Kemira Oy commissions new fertilizer units;Anonymous;Eur. Chem. News,1972b
4. Phosphoric acid production from Jhamar Kotra phosphate rock;Anonymous;Phosphorus Potassium,1972c
5. A new method for extracting uranium;Anonymous;Chem. Eng. News,1974a