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WikiPedia: Type 209 (lớp tàu ngầm) https://web.archive.org/web/20080315030731/http://... http://members.tripod.com/~fidelispark/flrev/repor... http://www.ara.mil.ar/pag.asp?idItem=245 http://www.globalsecurity.org/military/world/europ... http://www.hazegray.org/worldnav/ http://www.youtube.com/watch?v=uAeS5jfW5cg http://www.bharat-rakshak.com/NAVY/Submarines/Acti... http://www.defenseindustrydaily.com/images/SHIP_SS... http://www.deagel.com/Conventional-Attack-Submarin... https://commons.wikimedia.org/wiki/Category:Type_2...