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  1. 1
    published 1971
    Book Conference Proceedings
  2. 2
  3. 3
    by Siefert, Helge
    published 1990
    Book
  4. 4
    published 1989
    Book
  5. 5
    by Goldberg, Gisela
    published 1986
    Book
  6. 6
  7. 7
    published 1991
    Book
  8. 8
    published 1998
    Book
  9. 9