@article {974,
	title = {The cost of defense against herbivores: an experimental study of trichome production in Brassica rapa},
	journal = {American Naturalist},
	volume = {41},
	year = {1993},
	month = {1993///},
	pages = {338 - 350},
	author = {Agren,J. and Schemske,D.W.}
}
