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參考資料

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↑ 這個數值在各種資料來源中有所出入，因此四捨五入為2.1%，但其精確值是很理論的，因為很少會做出含碳量如此的純碳鋼。見：
Smith & Hashemi 2006，第363頁—2.08%.
Degarmo, Black & Kohser 2003，第75頁—2.11%.
Ashby & Jones 1992—2.14%.
↑  Smith & Hashemi 2006，第363頁.
↑  Smith & Hashemi 2006，第365–372頁.
1 2  Smith & Hashemi 2006，第373–378頁.
1 2  Smith & Hashemi 2006，第388頁.
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