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Revision of the bee genus Braunsapis in the Oriental region (Apoidea: Xylocopinae: Allodapini)

Published in University of Kansas Science Bulletin, in 1991, in volume 54, pages 179-207

Classification and phylogenetic relationships of the panurgine bees: the Calliopsini and allies (Hymenoptera: Andrenidae)

Published in University of Kansas Science Bulletin, in 1991, in volume 54, pages 209-256

Revision of the cleptoparasitic bee tribe Isepeolini (Hymenoptera: Anthophoridae)

Published in University of Kansas Science Bulletin, in 1991, in volume 54, issue 8, pages 257-288