Abro, Ghulam E Mustafa, and Ayman M Abdallah. “Observer-Driven LQR and FOLQR Control for Enhanced Stability of Underactuated 2-DOF Helicopter”. Instrumentation 12, no. 1 (March 31, 2025). Accessed April 1, 2026. https://instrumentationjournal.com/index.php/instr/article/view/263.