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Zatsuwa, Monosagu (2005). "気をつけよう,軟弱地盤と標準貫入試験" [Beware, soft ground and the standard penetration test] (in Japanese). Public Works Research Institute. Archived from the original on January 20, 2013.
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Zatsuwa, Monosagu (2005). "気をつけよう,軟弱地盤と標準貫入試験" [Beware, soft ground and the standard penetration test] (in Japanese). Public Works Research Institute. Archived from the original on January 20, 2013.