Genetic variation in bumblebees (Bombus, Psithyrus) and putative sibling species of Bombus lucorum
Pamilo, P., Varvio-Aho, S.-L., & Pekkarinen, A. (1984). Genetic variation in bumblebees (Bombus, Psithyrus) and putative sibling species of Bombus lucorum. Hereditas, 101, 245-251.