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WikiPedia: U-140 (tàu ngầm Đức) (1940) https://uboat.net/boats/u140.htm http://uboat.net/boats/successes/u140.html http://uboat.net/boats/u140.htm https://www.google.com/books/edition/Der_U_Boot_Kr... https://www.google.com/books/edition/German_Warshi... http://www.u-boot-archiv.de/dieboote/u0140.html