Institut za gorata (B ulgarska akademi i a na naukite). (2001). Silva Balcanica. Forest Research Institute - Bulgarian Academy of Sciences (FRI-BAS).
Chicago-čujuhus (17. p.)Institut za gorata (B ulgarska akademi i a na naukite). Silva Balcanica. Sofia, Bulgaria: Forest Research Institute - Bulgarian Academy of Sciences (FRI-BAS), 2001.
MLA-čujuhus (9. p.)Institut za gorata (B ulgarska akademi i a na naukite). Silva Balcanica. Forest Research Institute - Bulgarian Academy of Sciences (FRI-BAS), 2001.
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