J.  Suhonen, Rannikko, J., and Sorvari, J., ?The rarity of host species affects the co-extinction risk in socially parasitic bumblebee Bombus (Psithyrus) species. ?, Ann. Zool. Fennici , vol. 52, pp. 236?242, 2015.

J.  Suhonen, Rannikko, J., and Sorvari, J., ?Species richness of cuckoo bumblebees is determined by the geographical range area of the host bumblebee?, Insect Conservation and Diversity , vol. 9, pp. 529?535, 2016.