@book{
      international1969iaea,
      title={Experimental Techniques for Co-ordinated Field Fertility Experiments Using Isotopically Labelled Fertilizers (Vienna, 27 Nov. - 1 Dec. 1967)},
      author={ },
      series={entity},
      number={113 },
      year={1969},
      isbn={ },
      url={/publications/354/experimental-techniques-for-co-ordinated-field-fertility-experiments-using-isotopically-labelled-fertilizers-vienna-27-nov-1-dec-1967 },
      publisher={INTERNATIONAL ATOMIC ENERGY AGENCY },
      address={Vienna}
    }