The Sphegina species of eastern North America (Diptera: Syrphidae)
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Coovert, G. C. and Thompson, F. Christian. 1977. "<a href="https://repository.si.edu/handle/10088/17073">The Sphegina species of eastern North America (Diptera: Syrphidae)</a>." <em>Proceedings of the Biological Society of Washington</em>, 90 536–552.