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Type Year Authors Title Source ID
Book Section 1989 Virgina, R. A. The use of variation in the natural abundance of <sup>15</sup>N to assess symbiotic nitrogen fixation by woody plants Stable isotopes in ecological research [Virgina, 1989 #24457]
Journal Article 1986 Shearer, G. N<sub>2</sub>-fixation in field settings: estimations based on natural <sup>15</sup>N abundance Australian Journal of Plant Physiology [Shearer, 1986 #34506]
Journal Article 1983 Shearer, G. Estimates of N2-fixation from variation in the natural abundance of 15N in Sonoran desert ecosystems Oecologia [Shearer, 1983 #34505]