Verayunia, S. S., S. M. M. Wulan, N. I. Handajani, A. Darma, and S. Melaniani. “Effects of Adding Interferential Current (IFC) in Standard Therapy (Lactulose) in Cerebral Palsy Children With Constipation: A Randomized Controlled Trial”. International Journal of Health Sciences, vol. 6, no. S9, Sept. 2022, pp. 466-78, doi:10.53730/ijhs.v6nS9.12372.