Husna L, Riyanto A. Implikasi Perjanjian Internasional Flight Information Region (FIR) Singapura atas Ruang Udara Indonesia terhadap Kepulauan Riau. SNISTEK [Internet]. 2019Nov.15 [cited 2024Nov.21];2:127-32. Available from: https://ejournal.upbatam.ac.id/index.php/prosiding/article/view/1520