Smirnov, E.S., & Polejaeff, W.G. 1934 [Density of population and sterility of the females on the coccid Liepidosaphes ulmi L.] Populationsdichte und Sterilität der Weibchen bei der Schildlaus Lepidosaphes ulmi L.. Journal of Animal Ecology 3: 29-40.

Notes: Concludes that high population densities inhibit excessive reproduction. Also in Wiss. Ber. der Meskauer Staatsuniv, 4 (2): 311-322.