@book{ international1991iaea, title={Stable Isotopes in Plant Nutrition, Soil Fertility and Environmental Studies}, series={Proceedings Series}, year={1991}, isbn={92-0-010391-X}, url={http://www.dgdingfa.net/publications/3716/stable-isotopes-in-plant-nutrition-soil-fertility-and-environmental-studies}, publisher={INTERNATIONAL ATOMIC ENERGY AGENCY}, address={Vienna} }
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