“Singularity of the Digit Inversor in $Q_3$-Representation of the Frac- Tional Part of a Real Number, Its Fractal and Integral Properties”. Neliniini Kolyvannya, vol. 18, no. 1, Mar. 2015, pp. 55-70, https://twinhead.imath.kiev.ua/index.php/nosc/article/view/769.