[Syrphidae] Stackelberg 1956 Sphegina

[Gerard Pennards]

Dear All,
Could someone share the following publication with me? That would be great.
Thanks in advance!
Gerard

Stackelberg, A. A. 1956. Neue Angaben über die Systematik der paläarktischen
Sphegina-Arten (Diptera, Syrphidae), II. – Entomologicheskoe Obozrenie 35(4): 935-943.
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