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WikiPedia: U-47 (tàu ngầm Đức) (1938) https://uboat.net/boats/u47.htm https://uboat.net/types/viib.htm https://uboat.net/boats/patrols/u47.html https://uboat.net/allies/merchants/ship/806.html http://uboat.net/boats/successes/u47.html http://uboat.net/ops/successful_boats.htm http://uboat.net/boats/patrols/patrol_329.html http://uboat.net/boats/u47.htm https://www.google.com/books/edition/Der_U_Boot_Kr... https://www.google.com/books/edition/German_Warshi...