Kozár, F., & Dávid, A.N. 1986 The unexpected northward migration of some species of insects in Central Europe and the climatic changes.. Anzeiger Schädlingskunde, Pflanzen(schutz) und Umweltschutz 59(5): 90-94.

Notes: Cause of expansion (200 to 700 km) believed to be several consecutive mild winters; considerable economic problems resulted; species discussed include Pseudaulacaspis pentagona.