This page lists some white papers and articles related to audio watermarking and written by Alex Radzishevsky.
1. Alex Radzishevsky, Visual Domain Audio Watermarking (VDAW) and Spectral Barcode Audio Watermarking (SBAW), February 2014. [Read here its web-version with audio examples]
2. Alex Radzishevsky, Watermark embedding and extraction, United States Patent No. 8,116,514, February 2012.