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Draganova S., D. Takov, D. Doychev. 2007.
Bioassays with Isolates of Beauveria bassiana (Bals.) Vuill. and Paecilomyces farinosus (Holm.) Brown & Smith Against Ips sexdentatus Boerner and Ips acuminatus Gyll. (Coleoptera: Scolytidae).
Plant Science, 44: 24-28.