Central Place Theory--by Walter Christaller
General Theory
http://en.wikipedia.org/wiki/Central_place_theory
some chinese Case
http://blog.163.com/shanzq@126/blog/static/118211046200963095828600/
Shanghai Case
http://www.chinacity.org.cn/csfz/fzzl/56639.html
Holland Case
http://360edu.com/tongbu/gaoyi/7835/g1dlf831.htm
