S. R. Hasibuan, M. H. A. Mahardika, A. D. Addaruqutni, and F. Kartiasih, “Determination of macroeconomic factors on Indonesia’s oil and gas imports: an ECM approach”, J. Econ. Res. Policy Stud., vol. 5, no. 2, pp. 303–321, Jun. 2025.