http://books.google.fr/books?id=yPsOAAAAQAAJ&pg=PA163&lpg=PA163&dq=middicucchi&source=web&ots=AZfmtgqexL&sig=h0lKarxxpJyzi0CTLfgRcaK9Pug&hl=fr&sa=X&oi=book_result&resnum=1&ct=result#PPA164,M1
