WASET
    Su Cheng Haw and  G. S. V. Radha Krishna Rao,  Query Optimization Techniques for XML Databases.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2008, vol. 22(10). 3612 - 3619
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/3191.