@conference {cSayrol99,
	title = {Optimum Watermark Detection in Color Images},
	booktitle = {1999 IEEE International Conference on Image Processing},
	year = {1999},
	pages = {1{\textendash}5},
	author = {Elisa Sayrol and Vidal, J. and Cabanillas, S. and Santamaria, S.}
}
@conference {cVidal98a,
	title = {Optimum Watermark Detection and Embedding in Digital Images},
	booktitle = {1998 IEEE Second Workshop on Multimedia Signal Processing},
	year = {1998},
	pages = {285{\textendash}290},
	isbn = {0-7803-4919-9},
	author = {Vidal, J. and Elisa Sayrol}
}
