K. N. Patel, S. A. Shah, and D. B. Shah, “Robust and Secured Digital Audio Watermarking using Improved DWT-SVD-DFT Approach”, IJET, vol. 7, no. 3.12, pp. 1112–1117, Jul. 2018, doi: 10.14419/ijet.v7i3.12.17771.