@article{voisin_2003, 
  title={Symbiotic N2 fixation activity in relation to C economy of Pisum sativum L. as a function of plant phenology}, 
  volume={54}, 
  DOI={10.1093/jxb/erg290}, 
  number={393}, 
  publisher={Oxford University Press (OUP)}, 
  author={Voisin}, 
  year={2003}, 
  month={Oct}
  }