1. On the limits of steganography
2. Cooperman, M., and Moskowitz, S.: ‘Steganographic method and device’, USA, (5,613,004)
3. Lee, C., Moallemi, K., and Warren, R.: ‘Method and apparatus for transporting auxiliary data in audio signals’, USA, (5,822,360)
4. Robust audio watermarking using perceptual masking