Requena-Pérez, J., J. Ayuso Muñoz, J. R. Jiménez-Romero, and F. Agrela. “A New Equation to Predict the Footings Settlement on Sand Based on the Finite Element Method”. Spanish Journal of Agricultural Research, Vol. 10, no. 4, Sept. 2012, pp. 967-76, doi:10.5424/sjar/2012104-3013.