@book {eSayrol01,
	title = {Senyals i sistemes anal{\`o}gics: una introducci{\'o} pr{\`a}ctica},
	year = {2001},
	isbn = {84-8301-510-2},
	url = {www.edicionsupc.es},
	author = {Elisa Sayrol and Gasull, A. and Moreno, A. and Salavedra, J. and Vallverdu, F.}
}
