León, L., R. de la Rosa, L. Rallo, N. Guerrero, and D. Barranco. “Influence of Spacing on the Initial Production of Hedgerow ‘Arbequina’ Olive Orchards”. Spanish Journal of Agricultural Research, Vol. 5, no. 4, Nov. 2013, pp. 554-8, doi:10.5424/sjar/2007054-5358.