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M. Duane Nellis, John M. Briggs, Transformed Vegetation Index for Measuring Spatial Variation in Drought Impacted Biomass on Konza Prairie, Kansas, Transactions of the Kansas Academy of Science (1903-), Vol. 95, No. 1/2 (Apr., 1992), pp. 93-99
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Nellis et al. (1992) studied this question.
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