Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Thomson, M. 1939. Angreb af Tomicus chalcographus Paa unge sitkagraner, rodgraner og douglasgraner [Attack of Tomicus chalcographus on young Sitka spruce, Norway spruce and Douglas fir] . Det Forstlige Forsgsvaesen i Danmark 15:199-208.