WASET
    Kalum Priyanath Udagepola and  Zuo Decheng and  Wu Zhibo and  Yang Xiaozong,   Semantic Spatial Objects Data Structure for Spatial Access Method.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2007, vol. 2(2). 328 - 335
    [viewed 28 March 2024]. Available from: https://publications.waset.org/pdf/10998.