@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.dgdingfa.net/publications/3056/tracer-studies-on-non-protein-nitrogen-for-ruminants}, publisher={INTERNATIONAL ATOMIC ENERGY AGENCY}, address={Vienna} }
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