Widiyanto, A., Atmojo, J. T. and Handayani, R. T. (2021) “Trend Analysis of the Mobile Health COVID-19 Application As A Preventive Strategy in the Era of COVID-19 Pandemic in Surakarta”, Journal of Health Promotion and Behavior, 6(2), pp. 104–111. Available at: https://www.thejhpb.com/index.php/thejhpb/article/view/314 (Accessed: 2 August 2025).