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  Cetacea.de | News-Archiv 2002

  https://web.archive.org/web/20110202190422/http://www.cetacea.de/news/archiv/2002/06/arch020624.shtml

  Wale und Delphine -Nachrichtendienst bei Cetacea.de. Nachrichten-Archiv.

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  Possible hybrid between a fin whale and a blue whale | Cetacea.de

  https://web.archive.org/web/20150225025316/http://www.cetacea.de/artikel/feature/2008/hybrid/

  Possible hybrid between a fin whale and a blue whale. An article by Klaus Barthelmess

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