Beitalmal , Abdusslam Osman. “Absolutely Continuous Invariant Measures for Piecewise Expanding Chaotic Transformations in R^n With Summable Oscillations of Derivative”. Journal of Pure & Applied Sciences 22, no. 2 (December 30, 2023): 73–82. Accessed November 21, 2024. https://sebhau.edu.ly/journal/jopas/article/view/2342.