Characterising particulate random media from near-surface backscattering: A machine learning approach to predict particle size and concentrationArtur L. Gower, Robert M. Gower, Jonathan Deakin, William J. Parnell and I. David AbrahamsEPL, 122 5 (2018) 54001DOI: https://doi.org/10.1209/0295-5075/122/54001