Moufaq Abdul Majeed Haleem, A., and A. Zakaria. “Hiding Digital Image Watermarking in a Sound Signal Using Wavelet Transform and Singular Value Decomposition”. AL-Rafidain Journal of Computer Sciences and Mathematics, vol. 10, no. 4, Dec. 2013, pp. 65-83, doi:10.33899/csmj.2013.163557 .