Ari Dwi Astono. Implementation of PPKM Level 2-4 Covid 19 Pandemic of Gunungpati, Semarang City: (Referring to the Regulation of the Mayor of Semarang No. 57 of 2020). JHPIS [Internet]. 2022 Mar. 29 [cited 2024 May 17];1(1):01-12. Available from: https://ejurnal.politeknikpratama.ac.id/index.php/jhpis/article/view/1698