@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}
}
