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  1. 1
    by Åkesson, B. (Björn)
    Published 2008
    Book
  2. 2
    by Scheer, Joachim
    Published 2010
    Get full text
    eBook
  3. 3
    by Vanev, Bojidar, 1947-
    Published 2007
    Book
  4. 4
    Published 2017
    Book