BlackmoreD., GoleniaJ., PrykarpatskyA. K., and PrykarpatskyY. A. “Invariant Measures for Discrete Dynamical Systems and Ergodic Properties of Generalized Boole-Type Transformations”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 65, no. 1, Jan. 2013, pp. 44-57, https://umj.imath.kiev.ua/index.php/umj/article/view/2403.