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The term “light” will be used in this paper as synonymous with solar radiation received at the surface of the earth unless otherwise qualified.
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Shirley, H.L. Light as an ecological factor and its measurement. Bot. Rev 1, 355–381 (1935). https://doi.org/10.1007/BF02868928
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DOI: https://doi.org/10.1007/BF02868928