Sardadi, M. , Rahim, M. , Jupri, Z. , Daman, D. (2008), 'Choosing R-tree or Quadtree Spatial DataIndexing in One Oracle Spatial Database System to Make Faster Showing Geographical Map in Mobile Geographical Information System Technology', World Academy of Science, Engineering and Technology, Open Science Index 22, International Journal of Computer and Information Engineering, 2(10), 3345 - 3353.