Tarhda, M. et al. 2013. Audio Watermarking Systems - Design, Implementation and Evaluation of an Echo Hiding Scheme Using Subjective Tests and Common Distortions. International Journal of Recent Contributions from Engineering, Science & IT (iJES). 1, 2 (Nov. 2013), pp. 27–36. DOI:https://doi.org/10.3991/ijes.v1i2.3281.