D.-Y. Jung, S.-J. Yun, and Y.-S. Kim, “Development of Ankle-Foot Orthosis with Vibration Stimulator using Energy Harvesting Source for Cerebral Palsy Children”, IJET, vol. 7, no. 4.39, pp. 522–526, Dec. 2018, doi: 10.14419/ijet.v7i4.39.24368.