Chani, A. S. “Asymptotic Behavior of the Products of Random Matrices With Values on a Solvable Lie Algebra”. Ukrains’kyi Matematychnyi Zhurnal, vol. 45, no. 7, July 1993, pp. 1045–1048, https://umj.imath.kiev.ua/index.php/umj/article/view/5898.