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- [3] SCANDINAVIAN SPECIES OF THE GENUS PSITHYRUS LEPELETIER (HYMENOPTERA, APIDAE) ENTOMOLOGICA SCANDINAVICA, 1984, : 1 - 45
- [4] NUMERICAL TAXONOMIC ANALYSIS OF EVOLUTIONARY RELATIONSHIPS OF BOMBUS AND PSITHYRUS (APIDAE-HYMENOPTERA) CANADIAN ENTOMOLOGIST, 1973, 105 (05): : 733 - 743
- [5] POSSIBLE SYNAPOMORPHIES OF THE PARASITIC BUMBLEBEES (PSITHYRUS) WITH SOME NONPARASITIC BUMBLEBEES (BOMBUS) (HYMENOPTERA, APIDAE) SOCIOBIOLOGY, 1985, 10 (01): : 105 - 119
- [10] Distribution of species of the genus Bombus Latreille (Hymenoptera, Apidae) in Uruguay REVISTA DE LA SOCIEDAD ENTOMOLOGICA ARGENTINA, 2017, 76 (1-2): : 22 - 27