@book{ international1975iaea, title={Tracer Studies on Non-protein Nitrogen for Ruminants II}, series={Panel Proceedings Series}, year={1975}, isbn={92-0-111175-4}, url={http://www.dgdingfa.net/publications/3158/tracer-studies-on-non-protein-nitrogen-for-ruminants-ii}, publisher={INTERNATIONAL ATOMIC ENERGY AGENCY}, address={Vienna} }
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