Y. Chan, C., et al. “Positioning Control of an Antagonistic Pneumatic Muscle Actuated System Using Feedforward Compensation With Cascaded Control Scheme”. International Journal of Integrated Engineering, vol. 12, no. 2, Feb. 2020, pp. 70-74, https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/5301.