Kahl, Oliver
Ferrari, Simone
Kovalyuk, Vadim
Goltsman, Gregory N.
Korneev, Alexander
Pernice, Wolfram H. P.
Article History
Received: 13 February 2015
Accepted: 11 May 2015
First Online: 10 June 2015
Competing interests
: The authors declare no competing financial interests.