WASET
    N. Neysani Samany and  M.R. Delavar and  N. Chrisman and  M.R. Malek,  An Ontology for Spatial Relevant Objects in a Location-aware System: Case Study: A Tourist Guide System.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2012, vol. 63(3). 403 - 409
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/9529.