Spessivtsev, P. (. P. 1930d. Uber die Generationsdauer und forstwirtschaftliche Bedeutung der in schwedischen Waldern verbreiteten Pityophthorus micrographus L., Polygraphus polygraphus L., und Polygraphus subopacus Thos. Proc. Int. Cong. Forestry. Exptl. Stas. 1929:678-682, 1 fig.
Spessivtsev 1930
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