Tanthanapanyakorn, P., A. Sanguanchue, N. Khuntikulanon, S. Chanmalee, S. Cetthakrikul, and K. Wongpituk. “Effectiveness of the Self-Care Sandbag Exercise Program for the Osteoarthritis of Knee Patients in the Secondary Care in Thailand: Randomized Control Trial”. International Journal of Geoinformatics, vol. 17, no. 5, Nov. 2021, pp. 195-04, doi:10.52939/ijg.v17i5.2051.