Didukh, Yakiv, Olga Chusova, and Olga Demina. “Syntaxonomy of Chalk Outcrop Vegetation of the Order Thymo Cretacei-Hyssopetalia Cretacei”. Hacquetia 17, no. 1 (March 1, 2018). Accessed July 7, 2020. https://ojs.zrc-sazu.si/hacquetia/article/view/6719.