1. Natural radioactivity of Australian building materials waste and by-products;Beretka;Health Physics,1985
2. Radioactivity released from phosphate containing fertilizers and from gypsum;Guimond;Radiation Physics and Chemistry,1989
3. Radioactivity distribution in phosphate products, by-products, effluents and wastes;Guimond,1975
4. Radioactivity of fertilizers in Finland;Mustonen;The Science of the Total Environment,1985
5. Pakistan fertilizer related statistics;NFDC,1993