Fereydoon Sarmadian and  Ali Keshavarzi,  Developing Pedotransfer Functions for Estimating Some Soil Properties using Artificial Neural Network and Multivariate Regression Approaches.   journal   = {International Journal of Geological and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2010, vol. 48(12). 650 - 656
    [viewed 21 February 2020]. Available from: https://publications.waset.org/pdf/5214.