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Jose M. Facelli, Rolando J. C. Leon, V. Alejandro Deregibus, Community Structure in Grazed and Ungrazed Grassland Sites in the Flooding Pampa, Argentina, The American Midland Naturalist, Vol. 121, No. 1 (Jan., 1989), pp. 125-133
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Facelli et al. (1989) studied this question.
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