@book{ international1990iaea, title={International Centre for Theoretical Physics, Trieste: Scientific Activities in 1989}, series={TECDOC Series}, number={575}, year={1990}, url={http://www.dgdingfa.net/publications/831/international-centre-for-theoretical-physics-trieste-scientific-activities-in-1989}, publisher={INTERNATIONAL ATOMIC ENERGY AGENCY}, address={Vienna} }
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