@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.dgdingfa.net/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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