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2. Bracy, R.P., Parish, R.L., McCoy, J.E., 1998. Precision seeder uniformity varies with theoretical spacing. ASAE Paper No. 981095. ASAE, St. Joseph, MI.
3. Drill performance assessments: changed approach;Brooks;Br. Sugar Beet Rev.,1987
4. Granular flow: physical experiments and their implications for microstructural theories;Drake;J. Fluid Mech.,1991
5. Planter selection accuracy for edible beans;Halderson;Trans. ASAE,1983