<ref name="Ezhikov_1923">{{cite journal |first1=T. |last1=Ezhikov |year=1923 |title=Über den Character der Variabilität der Ameisen-Ovarien |url=http://hymfiles.biosci.ohio-state.edu/pdfs-osuc/23055/23055.pdf |journal=Russkii Zoologicheskii Zhurnal |publisher= |volume=3 |issue= |pages=353–357 |doi= }}</ref>