H. W. Polley, H. B. Johnson, H. S. Mayeux, Carbon Dioxide and Water Fluxes of C3 Annuals and C3 and C4 Perennials at Subambient CO2 Concentrations, Functional Ecology, Vol. 6, No. 6 (1992), pp. 693-703
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Polley et al. (1992) studied this question.
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