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