Topographic control of sorted circle morphology on Svalbard - Voigt, Joana; Hauber, Ernst; Reiss, Dennis; Hiesinger, H.; Johnsson, Andreas; van Gasselt, Stephan; Balme, M.; Head, J.W.; de Vera, Jean-Pierre; Steinbrügge, Gregor; Jaumann, Ralf (2015)