Valkó, Orsolya, Michal Zmihorski, Idoia Biurrun, Jacqueline Loos, Rocco Labadessa, in Stephen Venn. 2016. „Ecology and Conservation of Steppes and Semi-Natural Grasslands“. Hacquetia 15 (2). https://doi.org/10.1515/hacq-2016-0021.