@article {1387,
	title = {Facultative and obligate slavery in formicine ants: frequency of slavery and proportion of slaves. },
	journal = {Biol. J. Linnean Soc.},
	volume = {57},
	year = {1996},
	pages = {47-58},
	author = {Savolainen, R. and Deslippe, R. J.}
}
