Daudsyah, Teuku, & Muhammad Ridwan Lubis. " PATENT CANCELLATION AS AN EFFORT TO PROTECT PATENTS REGISTERED IN INTELLECTUAL PROPERTY RIGHTS." JURNAL RECTUM: Tinjauan Yuridis Penanganan Tindak Pidana [Online], 5.1 (2023): 864 - 871. Web. 7 Jul. 2024