@techreport{Kennedy2004,
author = {Kennedy, M.},
title= {Description of the Gaussian process model used in GEM-SA. Software manual},
year = {2004},
URL = {http://ctcd.group.shef.ac.uk/gem.html},
note = {Sheffield: Centre for Terrestrial Carbon Dynamics, University of Sheffield. (retrieved on 23/05/2012)},
}