@article {935,
	title = {Optimal traits when there are several costs: the interaction of mortality and energy costs in determining foraging behavior},
	journal = {Behavioral Ecology},
	volume = {4},
	year = {1993},
	month = {1993///},
	pages = {246 - 253},
	author = {Abrams,P.A.}
}
@article {1041,
	title = {Aggregation as a cost-reducing strategy for lycaenid larvae},
	journal = {Behavioral Ecology},
	volume = {9},
	year = {1998},
	month = {1998///},
	pages = {109 - 115},
	author = {Axen,A.H. and Pierce,N.E.}
}
