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The systematics of the hylaeine bees <Hymenoptera: Colletidae> of the Ethiopian zoogeographical region : the genera and subgenera with revisions of the smaller groups
- "The systematics of the hylaeine bees <Hymenoptera: Colletidae> of the Ethiopian zoogeographical region : the genera and subgenera with revisions of the smaller groups"
- "The systematics of the Hylaeine bees (Hymenoptera, Colletidae) of the Ethiopian zoogeographical region : the genera and subgenera with revisions of the smaller groups"