@article {767,
	title = {Climatic Information from Ratios of Cellulose in Tree Rings},
	journal = {Nature},
	volume = {262},
	year = {1976},
	keywords = {18 isotope, cellulose, climate, environment, O, oxygen, paleoclimatology, ratios, tree rings},
	author = {Gray, John and Thompson, Peter}
}
