K. A. Al-Afandy, E. M. EL-Rabaie, F. E. A. El-Samie, O. S. Faragallah, A. ELmhalaway, and A. M. Shehata "A Comparative Study For Color Systems Used In The DCT-DWT Watermarking Algorithm", Advances in Science, Technology and Engineering Systems Journal, vol. 1, no. 5, pp. 42–49, 2016, doi: 10.25046/aj010508.