E. . Indriyanto, A. E. . Yustika, H. . Prayitno, D. Setiawan, and D. N. A. M. Dewi, “Strategic Gaps in Indonesia’s Nickel and Electric Vehicle Battery Downstreaming: Implications for Investment Readiness”, OIKONOMIA, vol. 22, no. 1, pp. 1–16, Oct. 2026.