Nababan, Esther, and Pengarapen Bangun. “Konsep Generalized Gradient Pada Optimisasi Nonsmooth”. Talenta Conference Series: Science and Technology (ST) 1, no. 2 (December 20, 2018): 168 -174. Accessed November 24, 2024. https://talentaconfseries.usu.ac.id/st/article/view/294.