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Bassirirad H, Sehtiya H, Salim S, Constable J, Lussenhop J, Kimball B, Norby R, Oechel W, Reich P, Schlesinger W. Widespread foliage 15N depletion under elevated CO2: inferences for the nitrogen cycle. Global Change Biology. 2003;9:1-9.\par \par Bassirirad H, Reynolds JF, Virginia RA, Burnelle MH. Growth and root NO3- and PO4- uptake capacity of three desert species in response to atmospheric CO2 enrichment.  1997;24:353-358.\par \par }