Jianmei Yang Dong Zhuang Minyi Kuang The Study of Size Distribution and Spatial Distribution of Urban Systems in Guangdong, China. 82-89 2007 conf/iccS/2007-4 International Conference on Computational Science (4) http://dx.doi.org/10.1007/978-3-540-72590-9_11 db/conf/iccS/iccS2007-4.html#YangZK07