Kraus, H.
Soltamov, V. A.
Fuchs, F.
Simin, D.
Sperlich, A.
Baranov, P. G.
Astakhov, G. V.
Dyakonov, V.
Article History
Received: 14 May 2014
Accepted: 22 May 2014
First Online: 4 July 2014
Competing interests
: The authors declare no competing financial interests.