Valkó, Orsolya, Rocco Labadessa, in Stephen Venn. 2021. „Conservation, Restoration and Biodiversity of Palaearctic Grasslands – Editorial to the 6th EDGG Special Issue in Hacquetia“. Hacquetia 20 (1):167–170. https://doi.org/10.2478/hacq-2021-0008 .