(1)
Stekolshchikov, A. V.; Buga, S. V. The Taxonomic Status of Aphis rostellum (Zhang, Chen, Zhong & Li, 1999) and Description of the Fundatrix and Sexual Morphs of Aphis umbrella (Börner, 1950) (Hemiptera: Aphidoidea). Zootaxa 2017, 4347, 543–552.