@article {143,
	title = {Chemistry of Cirsium and Carduus: a role in ecological risk assessment for biological control of weeds?},
	journal = {Biochemical Systematics and Ecology},
	volume = {31},
	year = {2003},
	month = {12/2003},
	pages = {1353-1396},
	chapter = {1353},
	author = {Ingrid E. Jordon-Thaden and Svata M. Louda}
}
@article {271,
	title = {Ozone injury on cutleaf coneflower (Rudbeckia laciniata) and crown-beard (Verbesina occidentalis) in Great Smoky Mountains National Park},
	journal = {Environmental Pollution},
	volume = {125},
	year = {2003},
	month = {09/2003},
	pages = {53-59},
	chapter = {53},
	author = {A.H. Chappelka and H.S. Neufeld and A.W. Davison and G.L. Somers and J.R. Renfro}
}
@article {527,
	title = {Ageratina Aromatica (L.) Spach Lesser Snakeroot Conservation and Research Plan for New England},
	year = {2003},
	month = {03/2003},
	publisher = {New England Wild Flower Society},
	address = {Newton, MA},
	author = {Stephen I. Craine}
}
@article {454,
	title = {Pollen morphology of Achillea (Compositae-Anthemoideae) Species from Pakistan},
	journal = {Pakistan Journal of Weed Science},
	volume = {9},
	year = {2003},
	pages = {253-258},
	author = {Akbar Ali Meo and Mir Ajab Khan}
}
