Zolfaghari, Ali A., Meysam Abolkheiryan, Ali A. Soltani-Toularoud, Ruhollah Taghizadeh-Mehrjardi, and Amanuel O. Weldeyohannes. 2020. “Prediction of Soil Macronutrients Using Fractal Parameters and Artificial Intelligence Methods”. Spanish Journal of Agricultural Research 18 (2), e1104. https://doi.org/10.5424/sjar/2020182-15460.