@book{
      international1987iaea,
      title={Isotope Aided Studies on Non-protein Nitrogen and Agro-industrial By-products Utilisation by Ruminants},
      author={ },
      series={entity},
      number={ },
      year={1987},
      isbn={92-0-111087-1 },
      url={/publications/3606/isotope-aided-studies-on-non-protein-nitrogen-and-agro-industrial-by-products-utilisation-by-ruminants },
      publisher={INTERNATIONAL ATOMIC ENERGY AGENCY },
      address={Vienna}
    }