Asymptotically optimal perfect steganographic systems

@article{Ryabko2009AsymptoticallyOP,
  title={Asymptotically optimal perfect steganographic systems},
  author={B. Ya. Ryabko and Daniil Ryabko},
  journal={Probl. Inf. Transm.},
  year={2009},
  volume={45},
  pages={184-190}
}