Roland Kwitt Peter Meerwald Andreas Uhl A lightweight rao-cauchy detector for additive watermarking in the dwt-domain. 33-42 2008 MM&Sec http://doi.acm.org/10.1145/1411328.1411337 conf/mmsec/2008 db/conf/mmsec/mmsec2008.html#KwittMU08