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Hamada, Koichiro (6 May 2023). "武田軍も仰天「長篠の戦い前哨戦」驚きの仕掛け" [Surprising tricks of the 'Battle of Nagashino Outpost' that even the Takeda forces were astonished by]. Toyo Keizai Online (in Japanese). Toyo Keizai. Retrieved 18 October 2023.
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