Osiadacz, B. and Hałaj, R. 2014. First records of gall-inducing aphid <i>Pemphigus populi</i> (Hemiptera: Aphidoidea, Eriosomatidae) in Poland with gall-based key to Central and North European species of the genus. Entomologica Fennica. 25, 1 (Apr. 2014), 16–26. DOI:https://doi.org/10.33338/ef.41466.