Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Ryvkin, B. V. 1951. Priciny obrazovanija koroednyh ocagov v Vjalovskom Gosudarstvennom zapovednike [Reasons for the development of foci of bark beetle infestation in the Vyalov State Forest Reserve] . Priroda, Moskva 40:80-81.