Abstract
We thank P. Fre and C. Maccaferri for fruitful discussions. This research is original and has a financial support of the Universita del Piemonte Orientale (Fondi Ricerca Locale).
Highlights
This article is distributed under the terms of the Creative Commons Attribution License
This research is original and has a financial support of the Universita del Piemonte Orientale (Fondi Ricerca Locale)
Summary
Published for SISSA by Springer Received: July 20, 2018
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