Rogozhina, Irina
Petrunin, Alexey G.
Vaughan, Alan P. M.
Steinberger, Bernhard
Johnson, Jesse V.
Kaban, Mikhail K.
Calov, Reinhard
Rickers, Florian
Thomas, Maik
Koulakov, Ivan
Article History
Received: 18 December 2015
Accepted: 1 March 2016
First Online: 4 April 2016
Competing interests
: The authors declare no competing financial interests.