＜The modified ruler function のまとめサイト下記＞ Topic: Differentiability of the Ruler Function Dave L. Renfro Posted: 2006-2007
www.unirioja.es/cu/jvarona/downloads/Differentiability-DA-Roth.pdf DIFFERENTIABILITY OF A PATHOLOGICAL FUNCTION, DIOPHANTINE APPROXIMATION, AND A REFORMULATION OF THE THUE-SIEGEL-ROTH THEOREM JUAN LUIS VARONA 2009 This paper has been published in Gazette of the Australian Mathematical Society, Volume 36, Number 5, 2009
https://kbeanland.files.wordpress.com/2010/01/beanlandrobstevensonmonthly.pdf Modifications of Thomae’s function and differentiability, (with James Roberts and Craig Stevenson) Amer. Math. Monthly, 2009
