D. J. Beerling, F. I. Woodward, Leaf Stable Carbon Isotope Composition Records Increased Water-Use Efficiency of C3 Plants in Response to Atmospheric CO2 Enrichment, Functional Ecology, Vol. 9, No. 3 (Jun., 1995), pp. 394-401
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Beerling et al. (1995) studied this question.
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