Yong ZHANG and  Xiamu NIU and  Dongning ZHAO,  A Method of Protecting Relational Databases Copyright with Cloud Watermark .   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2007, vol. 3(3). 769 - 773
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/4036.