1. Physical and chemical properties of fertilizers and methods for their determination;Hignett,1985
2. The theory of the centrifugal distributor, I: motion on the disc, near-centre feed;Patterson;Journal of Agricultural Engineering Research,1962
3. The theory of the centrifugal distributor, II: motion on the disc, off-centre feed;Inns;Journal of Agricultural Engineering Research,1962
4. Performance characteristics of bulk spreaders for granular fertilizer;Cunningham;Transactions of the American Society of Agricultural Engineers,1963
5. Design relationships for centrifugal distributors;Cunningham;Transactions of the American Society of Agricultural Engineers,1967