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|doi= 10.2307/2026089
|jstor= 2026089
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*{{cite web
|last= Tait
|first= W.W.
|authorlink= William W. Tait
|year= 2010
|title= Primitive Recursive Arithmetic and its Role in the Foundations of Arithmetic: Historical and Philosophical Reflections
|url=https://home.uchicago.edu/~wwtx/PRA2.pdf
}}
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