In memory of Delio Ruggiu (July 31st 1934 – August 8th 2004)
Submitted: 8 December 2011
Accepted: 8 December 2011
Published: 1 August 2004
Accepted: 8 December 2011
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All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.