In memory of Oscar Ravera
Submitted: 9 November 2015
Accepted: 9 November 2015
Published: 13 April 2016
Accepted: 9 November 2015
Abstract Views: 1969
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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.