Han, Seung Hun, Manh Son Tran, and Duc Thien Tran. “Adaptive Sliding Mode Control for Robotic Manipulators With Unknown Friction and Unknown Control Direction: A Recent Study ”. New Visions in Science and Technology Vol. 10 (November 13, 2021): 1–18. Accessed June 19, 2026. https://stm.bookpi.org/NVST-V10/article/view/4880.