Meyer, Stefan, Karsten Wesche, Christoph Leuschner, Thomas van Elsen, and Jürgen Metzner. 2010. “A New Conservation Strategy for Arable Plant Vegetation in Germany – the Project”. Plant Breeding and Seed Science 61 (June):25-34. http://ojs.ihar.edu.pl/index.php/pbss/article/view/581.