Koshmanenko, V. D., and N. V. Kharchenko. 2004. “Invariant Points of a Dynamical System of Conflict in the Space of Piecewise-Uniformly Distributed Measures”. Ukrains’kyi Matematychnyi Zhurnal 56 (7), 927–938. https://umj.imath.kiev.ua/index.php/umj/article/view/3809.