Mussarat Abdullah and Fazal Wahab, Key Based Text Watermarking of E-Text Documents in an Object Based Environment Using Z-Axis for Watermark Embedding. journal = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology. October 2008, vol. 22(10). 3341 - 3344 [viewed 28 March 2024]. Available from: https://publications.waset.org/pdf/6265.