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Ainsworth, Elizabeth A.; Long, Stephen P. (2 November 2020). "30 years of free-air carbon dioxide enrichment (FACE): What have we learned about future crop productivity and its potential for adaptation?". Global Change Biology. 27 (1): 27–49. doi:10.1111/gcb.15375. PMID33135850. S2CID226235328.
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Ainsworth, Elizabeth A.; Long, Stephen P. (2 November 2020). "30 years of free-air carbon dioxide enrichment (FACE): What have we learned about future crop productivity and its potential for adaptation?". Global Change Biology. 27 (1): 27–49. doi:10.1111/gcb.15375. PMID33135850. S2CID226235328.