Soza, E., G. Botta, M. Tourn, and R. Hidalgo. 2004. “Sowing Efficiency of Two Seeding Machines With Different Metering Devices and Distribution Systems: A Comparison Using Soybean, Glycine Max (L) Merr.”. Spanish Journal of Agricultural Research 2 (3), 315-21. https://doi.org/10.5424/sjar/2004023-86.