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Authors
Zavjalov, V. V.
Autti, S.
Eltsov, V. B.
Heikkinen, P. J.
Volovik, G. E.
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Article History
Received: 4 May 2015
Accepted: 26 November 2015
First Online: 8 January 2016
Competing interests
: The authors declare no competing financial interests.
