@article {177,
	title = {Chromosomal Differentiation between Cirsium discolor and C. muticum and the Origin of Supernumerary Chromosomes},
	journal = {Systematic Botany},
	volume = {2},
	year = {1977},
	month = {03/1977},
	pages = {1-13},
	chapter = {1},
	author = {William L. Bloom}
}
