Hutagalung S, de Fretes E, Gaspersz F. ANALISIS PERHITUNGAN BALLAST MATI PADA KAPAL KN. KALAWAI. ale [Internet]. 31Oct.2023 [cited 2Apr.2025];6:125-32. Available from: https://ojs3.unpatti.ac.id/index.php/ale/article/view/11235