1. Weiser M (1991) The computer for the twenty-first century. Sci Am 265:94–104 IEEE Pervasive Comput 2002:19–25
2. Lu JH, Wang CY, Hwang RH (2009) An open framework for distributed context management in ubiquitous environment. International symposium on UbiCom frontiers—innovative research, systems and technologies (Ufirst) 88–93
3. Wang CY, Hwang RH (2009) Context-aware path planning in ubiquitous network. Ubiquitous Intell Comput 5585:54–67
4. Kettani D, Moulin B (1999) A spatial model based on the notions of spatial conceptual map and of object’s influence areas. Spat Inf Theory Cogn Comput Found Geogr Inf Sci 1661:401–416
5. Goldberg DE (1989) Genetic algorithms in search, optimization, and machine learning. Addison-Wesley, Massachusetts