Coefficient Selection Methods for Scalable Spread Spectrum Watermarking. - Angela Piper; Reihaneh Safavi-Naini; Alfred Mertins (IWDW, 2003)

Resolution and quality scalable spread spectrum image watermarking. - Angela Piper; Reihaneh Safavi-Naini; Alfred Mertins (MM&Sec, 2005)

How to Compare Image Watermarking Algorithms. - Angela Piper; Reihaneh Safavi-Naini (Trans. Data Hiding Multim. Secur., 2009)

Scalable fragile watermarking for image authentication. - Angela Piper; Reihaneh Safavi-Naini (IET Inf. Secur., 2013)