Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Ogibin, B. N. 1973a. Vlyanie plotnosti posaleniya na plodovitost koroeda tipografa [Effect of colonization density on the fertility of Ips typographus] . Ekologiya, Akademiia Nauk SSSR 5:66-72.