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  1. 1
    Article
  2. 2
    by Coutts, Christopher
    Published 2016
    Book
  3. 3
    by Gray, Murray
    Published 2013
    Book
  4. 4
  5. 5
  6. 6
  7. 7
    Published 2001
    Book
  8. 8
  9. 9
    Published 1992
    Thesis
  10. 10
  11. 11
  12. 12
    Published 1972
    Book