Ritt, J. F. (1916). „On Certain Real Solutions of Babbage's Functional Equation”. The Annals of Mathematics. 17 (3): 113. JSTOR2007270. doi:10.2307/2007270.
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Ritt, J. F. (1916). „On Certain Real Solutions of Babbage's Functional Equation”. The Annals of Mathematics. 17 (3): 113. JSTOR2007270. doi:10.2307/2007270.