@article {730,
	title = {Lichen Communities on Conifers in Southern California Mountains: An Ecological Survey Relative to Oxidant Air Pollution},
	journal = {Ecology},
	volume = {64},
	number = {6},
	year = {1983},
	pages = {1343-1354},
	url = {http://www.jstor.org/stable/pdfplus/1937489.pdf},
	author = {Lorene L. Sigal and Thomas H. Nash III}
}
