Torsvik, Trond H.
Doubrovine, Pavel V.
Steinberger, Bernhard
Gaina, Carmen
Spakman, Wim
Domeier, Mathew
Article History
Received: 12 January 2017
Accepted: 12 April 2017
First Online: 5 June 2017
Competing interests
: The authors declare no competing financial interests.