@book{
international2003iaea,
title={Guidelines for the Use of Isotopes of Sulfur in Soil鈥揚lant Studies},
series={Training Course Series},
number={20},
year={2003},
url={http://www.dgdingfa.net/publications/6812/guidelines-for-the-use-of-isotopes-of-sulfur-in-soil-plant-studies},
publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
address={Vienna}
}