@book{
  international1967iaea,
  title={Isotopes in Plant Nutrition and Physiology (Vienna, 5-9 Sept. 1966)},
  series={Proceedings Series},
  year={1967},
  isbn={92-0-010067-8},
  url={https://www.iaea.org/publications/2093/isotopes-in-plant-nutrition-and-physiology-vienna-5-9-sept-1966},
  publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
  address={Vienna}
}