@booklet {Freire07report,
	title = {Practical estimators of the secret spreading vector for Improved Spread Spectrum modulations. Statistical analysis and results},
	year = {2007},
	month = {November},
	publisher = {Signal Theory and Communications Department, University of Vigo, Spain},
	type = {Internal report},
	keywords = {data-hiding, security, watermarking},
	author = {Luis P{\'e}rez-Freire}
}
