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Hirel, B., & Limami, A. M. (2003). Prospects for improving nitrogen use efficiency: Insights given by 15N-labelling experiments. Phytochemistry Reviews, 2(1-2), 133–144. doi:10.1023/b:phyt.0000004186.60917.d4 
10.1023/b:phyt.0000004186.60917.d4