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Copyright responsibility: p. Petkov, G. Antonov
Source: Наука за гората
Year published: 1992
Volume: 3
Pages: p. 7-13
ID: LTU090004433
Copyright responsibility: B. Rossnev, p. Petkov, D. Georgiev
Source: Наука за гората
Year published: 1994
Volume: 1
Pages: с. 49-54
ID: LTU090004457
Copyright responsibility: N. Petkov, Z. Petkov, p. Tzenov
Source: Journal of balkan ecology
Year published: 2003
Volume: 4
Pages: p. 380-383
ID: LTU090007944
Copyright responsibility: D. Kanakov, p. Petkov, K. Stojanchev
Source: TRAKIA JOURNAL OF SCIENCES
Year published: 2004
Volume: 1
Pages: pg. 58-63
ID: LTU090011060
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