Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Tsankov, G., and B. Rosnev. 1978. Prouchvane na v zmokhnostite za prenasyane na korenovata g'ba (Fomes annosus Fr) ot nasekomi [Studies on the possibilities of spreading Fomes annosus (Fr) by insects] . Gorskostopanska Nauka 15:89-95.