Paper  doi  bibtex   

@article{callaway_impact_1998,
	title = {Impact of a parasitic plant on the zonation of two salt marsh perennials},
	volume = {114},
	issn = {0029-8549, 1432-1939},
	url = {http://www.springerlink.com/content/je8mru7yatg65kqe/},
	doi = {10.1007/s004420050425},
	urldate = {2011-11-11TZ},
	journal = {Oecologia},
	author = {Callaway, Ragan M. and Pennings, Steven C.},
	month = mar,
	year = {1998},
	pages = {100--105}
}