Murillo, J., Moreno, F., Madejón, E., Girón, I. and Pelegrín, F. 2006. Improving soil surface properties: a driving force for conservation tillage under semi-arid conditions. Spanish Journal of Agricultural Research. 4, 1 (Mar. 2006), 97-104. DOI:https://doi.org/10.5424/sjar/2006041-180.