Erratum to: Energy efficiency

DOI 10.1007/s12053-016-9488-x

This paper was unfortunately published with error. The given name of one of the authors was incorrectly captured as “Vincenzo” when it should be “Giovanni.” Further, the email address should be corrected to giovanni.spallina@mail.polimi.it. This was then corrected and is not anymore present in the published copies of the article.