1. Drill performance assessment: a changed approach;Brooks;British Sugar Beet Review,1987
2. Development of some seeders with particular reference to pneumatic seed drills;Datta;The Harvester, Indian Institute of Technology, Kharagpur, India,1974
3. Vacuum nozzle design for seed metering;Fallack;Transactions of the ASAE,1984
4. Experimental and theoretical performance of a vacuum seed nozzle for vegetable seeds;Guarella;Journal of Agricultural Engineering Research,1996
5. Maximum yields need accurate planting;Hofman;The Sunflower,1988