Paper  bibtex   

@article{callaway_competition_1998,
	title = {Competition and facilitation a synthetic approach to interactions in plant communities},
	volume = {78},
	url = {http://luq.lternet.edu/publications/lterpub/callcomp.htm},
	journal = {Ecology},
	author = {Callaway, R.M. and Walker, L.R.},
	year = {1998},
	keywords = {LUQ, community, competition, plant community, facilitation, indirect interactions, interactions, life stage, positive interactions}
}