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參考文獻
Ferreirós, J. "Cantor's Derived Sets" 和 "Derived Sets and Cardinalities." §4.4.3 和 6.6 in Labyrinth of Thought: A History of Set Theory and Its Role in Modern Mathematics. Basel, Switzerland: Birkhäuser, pp. 141-144 和 202-208, 1999.在 上被引用
導集請引用為
Weisstein, Eric W. "Derived Set." 來自 -- 資源。 https://mathworld.tw/DerivedSet.html