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  1. Blake, Gerald Henry, ed. (1994). [ Google books World Boundary Series ]. Vol. 5 Maritime Boundaries. Routledge . ISBN   978-0-415-08835-0 . Retrieved 12 ?????? 2013 . {{ cite book }} : Check |url= value ( help )
  2. Piotr Migon (2010). Geomorphological Landscapes of the World . Springer. p. 349. ISBN   978-90-481-3055-9 . Retrieved 12 February 2013 .