Phunopas, A., T. Ito, Y. Kito, S. Ishimori, and T. Hayashi. “Locomotion of Pulse-Driven Microcapsule Robot on Inclined Plane”. Applied Science and Engineering Progress, vol. 4, no. 4, Sept. 2013, pp. 25-34, https://ph02.tci-thaijo.org/index.php/ijast/article/view/67350.