Kraemer, G. D. 1953. Die kritischen Grenzen der Brutbaumdisposition fur Borkenkaferbefall an Fichte (Picea excelsa L.) Untersuchungen zur Okologie von Ips typographus L., Pityogenes chalcographus L., Polygraphus poligraphus L., und Dendroctonus micans Kug. Zeitschrift fur Angewandte Entomologie 34(4):463-512.
Kraemer 1953
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