Dziedzicka, A., & Sermak, W. 1967 The variability of the dorsal-marginal glands in larvae II and females of Lecanium corni Bouché of Taxus baccata L.. Rocznik Naukowo-Dydaktyszny WSP w Krakowie, Prace z Zoologii 29: 25-31.

Notes: Note significant variation in occurrence of glands.