Yanmin Zhao and Siu Ming Yiu, A Watermarking Signature Scheme with Hidden Watermarks and Constraint Functions in the Symmetric Key Setting. journal = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology. June 2020, vol. 163(7). 270 - 277 [viewed 20 September 2024]. Available from: https://publications.waset.org/pdf/10011335.