Reference
Desislava Sopotlieva, Nikolay Velev, Nadya Tsvetkova, Vassil Vassilev, Iva Apostolova (2018): Ecosystem condition assessment of semi-natural grasslands outside the Natura 2000 network in Bulgaria, using vegetation data – Tuexenia - Mitteilungen der Floristisch-soziologischen Arbeitsgemeinschaft – NS_38: 385 - 404.