Jazentkovsky, A. V. 1931a. Beobachtungen der Borkenkaferherde. In Beobachtungsmethoden fur Walder, die von Schadlingen befallen sind. Leitfaden fur Forstbeamte [In Russian]. Forsttechnische Akademie, Ent. Phytopath. Abteilung des Forstwissenschaftlichen Zirkels, Leningrad 1931:65-102.
Jazentkovsky 1931
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