Vassilev, K., Apostolova, I. and Pedashenko, H. 2015. Festuco-Brometea in Western Bulgaria with an emphasis on Cirsio-Brachypodion pinnati. Hacquetia. 11, 2 (Aug. 2015). DOI:https://doi.org/10.2478/v10028-012-0011-4.