http://geology.geoscienceworld.org/content/early/2014/06/26/G35579.1.full.pdf+html
Mohamed M. Ezat, Tine L. Rasmussen and Jeroen Groeneveld
http://geology.geoscienceworld.org/content/early/2014/06/26/G35579.1.full.pdf+html
Mohamed M. Ezat, Tine L. Rasmussen and Jeroen Groeneveld