@book{
internationaliaea,
title={High Levels of Natural Radiation (proceedings of An International Conference, Organized by the Aeo of Iran in Co-operation With the IAEA, the Who, the Unep and the Ints and Held in Ramsar, Iran, 3-7 November 1990)},
series={Non-serial Publications},
year={},
url={http://www.dgdingfa.net/publications/141/high-levels-of-natural-radiation-proceedings-of-an-international-conference-organized-by-the-aeo-of-iran-in-co-operation-with-the-iaea-the-who-the-unep-and-the-ints-and-held-in-ramsar-iran-3-7-november-1990},
publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
address={Vienna}
}