Samadianfard, S., Sadraddini, A. A., Nazemi, A. H., Provenzano, G. and Kisi, O. (2012) “Estimating soil wetting patterns for drip irrigation using genetic programming”, Spanish Journal of Agricultural Research, 10(4), pp. 1155-1166. doi: 10.5424/sjar/2012104-502-11.