KirichenkoV. V., and PlakhotnykM. V. “Topological Conjugate Piecewise Linear Unimodal mappings of an Interval into Itself”. Ukrains’kyi Matematychnyi Zhurnal 68, no. 2 (February 25, 2016): 217-226. Accessed November 30, 2020. http://umj.imath.kiev.ua/index.php/umj/article/view/1835.