Akbar, F., Mardlijah, M. and Yunus, M. 2026. OPTIMAL CONTROL USING QUADRATIC-QUADRATIC REGULATOR (QQR) FOR MATHEMATICAL MODEL OF CATTLE FOOT AND MOUTH DISEASE (FMD). BAREKENG: Jurnal Ilmu Matematika dan Terapan. 20, 3 (Apr. 2026), 2427-2446. DOI:https://doi.org/10.30598/barekengvol20iss3pp2427-2446.