Ilyas TR. EFFECTIVENESS OF PPKM (ENFORCEMENT OF RESTRICTIONS ON COMMUNITY ACTIVITIES) EMERGENCY AND LEVELS 1-4 ON CONTROL OF SPREAD COVID 19 VIRUS IN EAST JAVA. Percipience [Internet]. 2021 Nov. 12 [cited 2026 Oct. 11];1(1):39-46. Available from: https://riset.unisma.ac.id/index.php/PERCIPIENCE/article/view/13515