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Michael F. Allen, Edith B. Allen, Peter D. Stahl, Differential Niche Response of Bouteloua gracilis and Pascopyrum smithii to VA Mycorrhizae, Bulletin of the Torrey Botanical Club, Vol. 111, No. 3 (Jul. - Sep., 1984), pp. 361-365
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Allen et al. (1984) studied this question.
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