Wu Defu and  Kiefer Chiam and  Yang Kin Seng,  Building an Interactive Web-Based GIS System for Planning of Geological Survey Works.   journal   = {International Journal of Civil and Architectural Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2015, vol. 99(3). 712 - 715
    [viewed 17 April 2021]. Available from: https://publications.waset.org/pdf/10000721.