Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Jorgensen, E., and B. Beier-Petersen. 1952. Mere om Fomes annosus og Hylesinuspiniperda [More on Fomes annosus and Hylesinus piniperda] . Dansk Skovforeningens Tidsskrift 37:213-218.