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