@article {992,
	title = {The rarity of host species affects the co-extinction risk in socially parasitic bumblebee Bombus (Psithyrus) species. },
	journal = {Ann. Zool. Fennici },
	volume = {52},
	year = {2015},
	pages = {236{\textendash}242},
	author = {Suhonen, J. and Rannikko, J. and Sorvari, J.}
}
