@article{Epstein2008,
author = {Epstein, J.M.},
title= {Why model?},
year = {2008},
URL = {http://jasss.soc.surrey.ac.uk/11/4/12.html},
journal = {Journal of Artificial Societies and Social Simulation},
volume = {11},
number = {4},
pages = {12},
}