Pratsiovytyi, M. V., & Torbin, H. M. (1995). Superfractality of the set of numbers having no frequency ofn-adic digits, and fractal probability distributions. Ukrains’kyi Matematychnyi Zhurnal, 47(7), 971–975. https://umj.imath.kiev.ua/index.php/umj/article/view/5492