Xiaoming Zhang Xiong Yin Zhaoyang Yu Histogram Specification-based Audio Watermarking Technology against Filtering Attacks in Time Domain. 951-956 2008 ISECS http://doi.ieeecomputersociety.org/10.1109/ISECS.2008.161 conf/isecs/2008 db/conf/isecs/isecs2008.html#ZhangYY08