[1]
D. B. Baker, β€žOn Palaearctic and Oriental species of the genera Pseudapis W.F. Kirby, 1900, and Nomiapis Cockerell, 1919 (Hymenoptera, Halictidae, Nomiinae)β€œ., contrib.entomol., Bd. 52, Nr. 1, S. 1–83, Aug. 2002.