Shaohua Liu Junsheng Yu Yuan'an Liu Jun Wei Peng Gao Wei Li Jiani Ma Make Highly Clustered Grid a Small World with Shorter Diameter. 109-116 2007 conf/gcc/2007 GCC http://doi.ieeecomputersociety.org/10.1109/GCC.2007.83 db/conf/gcc/gcc2007.html#LiuYLWGLM07