Tolon-Becerra, A., X. B. Lastra-Bravo, G. F. Botta, M. Tourn, P. Linares, M. Ressia, and R. Balbuena. 2011. “Traffic Effect on Soil Compaction and Yields of Wheat in Spain”. Spanish Journal of Agricultural Research 9 (2), 395-403. https://doi.org/10.5424/sjar/20110902-235-10.