Experimental study on watermark interference in multiple re-watermarking. - Daniel Mark; Andreas Uhl; Hartmut Wernisch (Security, Steganography, and Watermarking of Multimedia Contents, 2007)

Multiple re-watermarking using varying wavelet packets. - Jutta Hämmerle-Uhl; Michael Liedlgruber; Andreas Uhl; Hartmut Wernisch (ICME, 2008)

Multiple re-watermarking using varying non-stationary mra with parameterized wavelet filters. - Jutta Hämmerle-Uhl; Andreas Uhl; Hartmut Wernisch (MM&Sec, 2008)