Jing, W., L. W. Ang, S. Palaniappan, and B. He. “Robust Image Watermarking With Quaternion Fractional-Order Polar Harmonic-Fourier Moments Based On Wavelet Transformation: Resistance Against Rotation Attacks”. Journal of Informatics and Web Engineering, vol. 2, no. 1, Mar. 2023, pp. 56-75, doi:10.33093/jiwe.2023.2.1.6.