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Additional knowledge respecting taxonomy of the social wasp genus Ropalidia (Hymenoptera: Vespidae: Polistinae) from Vietnam, with new records of three species and an updated key to species

. Zootaxa. 4722, 1 (Jan. 2020), 34–40. DOI:https://doi.org/10.11646/zootaxa.4722.1.2.