Williams, P.H. et al. 2023. Bumblebees with big teeth: revising the subgenus Alpigenobombus with the good, the bad and the ugly of numts (Hymenoptera: Apidae). European Journal of Taxonomy. 892, 1 (Sep. 2023), 1–65. DOI:https://doi.org/10.5852/ejt.2023.892.2283.