Cephalic secretions of the bumblebee subgenus Sibiricobombus Vogt suggest Bombus niveatus Kriechbaumer and Bombus vorticosus Gerstaecker are conspecific (Hymenoptera, Apidae, Bombus)
Apidologie, 36 4 (2005) 571-584
DOI: https://doi.org/10.1051/apido:2005047