YULIANSYAH, M. R. .; SEMBEL, R. .; HAYMANS MANURUNG, A. . R&D Expenditures and Firm Performance of Plantation Firms Listed on the Indonesia Stock Exchange (IDX), 2019–2023. Jurnal Penelitian Kelapa Sawit, [S. l.], v. 33, n. 2, p. 135–145, 2025. DOI: 10.22302/iopri.jur.jpks.v33i2.323. Disponível em: https://jurnalkelapasawit.iopri.org/index.php/jpks/article/view/323. Acesso em: 4 sep. 2026.