1. 1
    by Upex, R. V.
    Published 1978
    Book
  2. 2
    by Szakáts, Alexander
    Published 1990
    Book
  3. 3
  4. 4
    by Elias, Patrick
    Published 1996
    Book
  5. 5
    by Gould, Tony
    Published 2008
    Book
  6. 6
    Published 2018
    Conference Proceeding Book
  7. 7
    Published 2021
    Conference Proceeding Book