Eidesen , P. B., E. Müller, C. Lettner, I. G. Alsos, M. Bender, M. Kristiansen, B. Peeters, F. Postma, and K. F. Verweij. “Tetraploids Do Not Form Cushions: Association of Ploidy Level, Growth Form and Ecology in the High Arctic <em>Saxifraga oppositifolia</em&gt; L. S. Lat. (Saxifragaceae) in Svalbard”. Polar Research, vol. 32, June 2013, doi:10.3402/polar.v32i0.20071.