Puspitaningrum, W. A., N. . Afiana Zaen, and C. . Umbul Wahjuni. “EPIDEMIOLOGY OF COVID-19 CASES IN THE KLATEN DISTRICT IN 2020”. Jurnal Berkala Epidemiologi, vol. 10, no. 2, May 2022, pp. 210-8, doi:10.20473/jbe.V10I22022.210-218.