Phukapak S, Koyama D, Hashikura K, Kama M, Murakami I, Yamada K. The Parameterization of All Disturbance Observers for Periodic Input Disturbances. ECTI-EEC [internet]. 2023 Jun. 27 [cited 2025 Apr. 9];21(2):249809. available from: https://ph02.tci-thaijo.org/index.php/ECTI-EEC/article/view/249809