TZONEV, R.; DIMITROV, M.; GUSSEV, C.; VULCHEV, V.; NIKOLOV, I. Classificaton of the relict forest communites of Palla’s Black Pine (Pinus nigra subsp. pallasiana) in Bulgaria. Hacquetia, [S. l.], v. 17, n. 2, 2018. DOI: 10.1515/hacq-2017-0011 . Disponível em: https://ojs.zrc-sazu.si/hacquetia/article/view/6958. Acesso em: 6 dec. 2025.