López-Garrido, R., Díaz-Espejo, A., Madejón, E., Murillo, J., Moreno, F. and Moreno, F. (2009) “Carbon losses by tillage under semi-arid Mediterranean rainfed agriculture (SW Spain)”, Spanish Journal of Agricultural Research, 7(3), pp. 706-716. doi: 10.5424/sjar/2009073-456.