Nekrashevich, V. V., A. S. Oliinyk, and V. I. Sushchanskii. 2010. “Metric Properties of Functions Defined by Partial Automata”. Ukrains’kyi Matematychnyi Zhurnal 62 (11), 1500–1510. https://umj.imath.kiev.ua/index.php/umj/article/view/2974.