“PANEL DATA REGRESSION ANALYSIS OF PORT SERVICES SERVICES TOWARDS RATE ACCEPTANCE NOT TAXES (PNBP) (Case Study: At the Class IV Harbor Authority and Kuala Tungkal Port Authority) ” (2020) Mathematical Sciences and Applications Journal, 1(1), pp. 31–41. Available at: https://online-journal.unja.ac.id/msa/article/view/10133 (Accessed: 3 October 2026).