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  1. 1
    Published 1984
    Continuing Resource
  2. 2
    Published 1974
    Continuing Resource
  3. 3
    Published 1971
    Continuing Resource
  4. 4
  5. 5
    by Magyar Tudományos Akadémia
    Published 1961
    Continuing Resource
  6. 6
  7. 7
    Continuing Resource
  8. 8
    Continuing Resource
  9. 9
    Continuing Resource