PENDEKATAN POSTULAT JARAK TERDEKAT RUMAH SAKIT RUJUKAN COVID-19 DI KERESIDENAN SURAKARTA INDONESIA MENGGUNAKAN HAVERSINE FORMULA . Semaster [Internet]. 2020 Dec. 30 [cited 2026 Mar. 27];1(1):103-11. Available from: https://journal.unilak.ac.id/index.php/Semaster/article/view/6033