@book{
international1980iaea,
title={Isotopes and Radiation Techniques in Soil and Water Conservation Studies in Africa (Regional Seminar, Khartoum, 29 Oct.-3 Nov. 1979)},
series={TECDOC Series},
number={236},
year={1980},
url={http://www.dgdingfa.net/publications/487/isotopes-and-radiation-techniques-in-soil-and-water-conservation-studies-in-africa-regional-seminar-khartoum-29-oct-3-nov-1979},
publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
address={Vienna}
}