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  1. 1
  2. 2
    Published 1997
    Available for UP System via Sage Premier.
    Continuing Resource
  3. 3
  4. 4
  5. 5
    Published 1976
    Available for UP System via Cambridge Core.
    Continuing Resource
  6. 6
  7. 7
    Published 1968
    Continuing Resource
  8. 8
    Published 1965
    Continuing Resource
  9. 9
    Published 1961
    Continuing Resource
  10. 10
    by Magyar Tudományos Akadémia
    Published 1961
    Continuing Resource