APOSTOLOVA, I.; MESHINEV, T. CLASSIFICATION OF SEMI-NATURAL GRASSLANDS IN NORTH-EASTERN BULGARIA. Annali di Botanica, [S. l.], v. 6, p. 29–52, 2006. DOI: 10.4462/annbotrm-9159. Disponível em: https://rosa.uniroma1.it/rosa04/annali_di_botanica/article/view/9159. Acesso em: 5 may. 2024.